AS FILED WITH THE 

As filed with the Securities and Exchange Commission on April 6, 2005.

Registration No. 333-            


SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 6, 2004 Registration No. 333-_________ ================================================================================ SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549 -------------------


FORM S-3

REGISTRATION STATEMENT UNDER

Under

THE SECURITIES ACT OF 1933 -------------------


NORTHWEST NATURAL GAS COMPANY (Exact

(Exact name of registrant as specified in its charter) OREGON 93-0256722 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.)


OREGON93-0256722

(State or other jurisdiction of

incorporation or organization)

(I.R.S. Employer

Identification No.)

One Pacific Square, 220 N.W. Second Avenue

Portland, Oregon 97209

503-226-4211 (Address,

(Address, including zip code, and telephone number, including area code, of registrant'sregistrant’s principal executive offices) ------------------- MARK S. DODSON President and Chief Executive Officer One Pacific Square, 220 N.W. Second Avenue Portland, Oregon 97209 503-226-4211 BRUCE R. DeBOLT JOHN T. HOOD, Esq. Senior Vice President, Finance, Thelen Reid & Priest LLP and Chief Financial Officer 875 Third Avenue One Pacific Square, 220 N.W. Second Avenue New York, New York 10022 Portland, Oregon 97209 212-603-2000 503-226-4211 (Names, addresses,


MARK S. DODSON

President and Chief Executive Officer

One Pacific Square,

220 N.W. Second Avenue

Portland, Oregon 97209

503-226-4211

DAVID H. ANDERSON

Senior Vice President and

Chief Financial Officer

One Pacific Square, 220 N.W.

Second Avenue

Portland, Oregon 97209

503-226-4211

JOHN T. HOOD, Esq.

Thelen Reid & Priest LLP

875 Third Avenue

New York, New York 10022

212-603-2000

(Name, address, including zip codes,code, and telephone numbers,number, including area codes,code, of agents for service) -------------------


Approximate date of commencement of proposed sale to the public:    From time to time after this Registration Statement becomes effective as determined by market conditions. effective.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.  |_| ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.  |X| x

If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  |_| ¨

If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  |_| ¨

If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box.  |_| ¨

CALCULATION OF REGISTRATION FEE


Title of each class of

securities to be registered

  Amount to be
registered(1)(2)
  Proposed maximum
offering price per
share(2)
  Proposed maximum
aggregate offering
price(3)
  Amount of
registration fee(4)

Common Stock, $3 1/6 Par Value

  750,000 shares  $35.70  $26,775,000  $3,152

Common Share Purchase Rights

  750,000 shares   —     —     —  

CALCULATION OF REGISTRATION FEE ============================================================================================= Proposed maximum Amount
(1)In addition, pursuant to Rule 416(a) of Titlethe Securities Act of each class1933, this registration statement also covers such indeterminable number of additional securities aggregate offering registration fee to be registered price (1)(2) (3) - --------------------------------------------------------------------------------------------- Debt Securities................................... Preferred Stock................................... Common Stock, $3 1/6 par value.................... Common Share Purchase Rights...................... - --------------------------------------------------------------------------------------------- Total $200,000,000 $19,820 ============================================================================================= (1) Includes an indeterminate number or amount of debt securities, shares of preferred stock and common stock (with common share purchase rights) as may from time to time be issued at indeterminate prices provided thatbecome deliverable as a result of stock splits, stock dividends or similar transactions, in no event willaccordance with the aggregate initial priceprovisions of all debt securities, preferred stock and common stock withthe Plan.
(2)The common share purchase rights sold under this registration statement exceed $200,000,000. If any such securities are issued at an original issue discount, then the aggregate initial offering price as so discounted shall not exceed $200,000,000, notwithstanding that the stated principal amount of such securities may exceed such amount. Since no separate considerationattached to and will be paid for the common share purchase rights, the registration fee for such securities is included in the fee fortrade with the common stock. The value attributable to the common share purchase rights, if any, is reflected in the market price of the common stock. (2)
(3)Estimated solely for the purposepurposes of calculating the registration fee. (3) Priorfee pursuant to Rule 457(c) under the filingSecurities Act of this registration statement, $60,000,000 aggregate principal amount1933 on the basis of the registrant's securities remained registeredaverage of the high and unsold under Registration Statement No. 333-100326 filed withlow prices of the SECregistrant’s common stock on October 4, 2002. The registration fee of $5,520 associated with the unsold securities has been offset fromNew York Stock Exchange composite tape on March 30, 2005.
(4)Since no separate consideration is paid for the common share purchase rights, the registration fee of $25,340 associated withfor such securities is included in the securities to be registered, and such unsold securities are hereby deemed deregistered. fee for the common stock.
THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SEC, ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE. SUBJECT TO COMPLETION, DATED ___________, 200_ PROSPECTUS $200,000,000 [GRAPHIC OMITTED][LOGO] [GRAPHIC OMITTED] NORTHWEST NATURAL GAS COMPANY DEBT SECURITIES PREFERRED STOCK and COMMON STOCK Northwest Natural Gas Company (NW Natural) may offer from time

Pursuant to time up to an aggregate of $200,000,000 of its securities. NW Natural will provide specific terms of its securities, including their offering prices, in supplements to this prospectus. The supplements may also add, update or change information contained in this prospectus. You should read this prospectus and any supplements carefully before you invest. NW Natural's common stock is listed on the New York Stock Exchange and tradesRule 429 under the symbol "NWN." NW Natural may offer these securities directly or through underwriters, agents or dealers. The supplements to thisSecurities Act, the prospectus will describe the terms of any particular plan of distribution, including any underwriting arrangements. The "Plan of Distribution" section on page ___filed as part of this registration statement will be used as a combined prospectus also provides more informationin connection with this registration statement and Registration Statement No. 333-68184.

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this topic. NW Natural's principal executive offices are located at One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209, and its telephone number is (503) 226-4211. NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. _________, 200_ - -------------------------------------------------------------------------------- registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.



The information in this prospectus is not complete and may be changed. Northwest Natural Gas Company may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED APRIL 6, 2005

PROSPECTUS

LOGO

NORTHWEST NATURAL GAS COMPANY

DIVIDEND REINVESTMENT AND

DIRECT STOCK PURCHASE PLAN

Common Stock


Northwest Natural Gas Company (NW Natural) has established its Dividend Reinvestment and Direct Stock Purchase Plan (Plan) to provide participants with a convenient way to purchase shares of common stock and reinvest all or a portion of the cash dividends paid on common stock in additional shares of NW Natural’s common stock.

Participants in the Plan may:

Reinvest cash dividends paid on the participants’ shares of NW Natural’s common stock in additional shares of common stock;

Increase their investment in NW Natural’s common stock by making optional cash payments of not less than $25 per investment and not more than $100,000 per calendar year and continue to receive cash dividends on shares registered in their names and held in certificate form;

Make an initial investment in NW Natural’s common stock with a cash investment of at least $250;

Receive, upon request, certificates for whole shares of common stock credited to their Plan accounts;

Deposit certificates representing common stock into their Plan accounts for safekeeping;

Sell shares of common stock credited to their Plan accounts; and

Withdraw from the Plan at any time.

This Plan amends and restates in its entirety NW Natural’s Dividend Reinvestment and Stock Purchase Plan.

Shares purchased under the Plan will, at NW Natural’s option, be (i) authorized but unissued shares purchased directly from NW Natural, (ii) shares purchased in the open market or in privately negotiated transactions, or (iii) any combination of the foregoing. Any open market or privately negotiated purchases will be made through an independent agent selected by the Agent. This prospectus relates to the offer and sale of up to 954,243 shares of common stock (including a like number of common stock purchase rights appurtenant thereto) offered under the Plan.

Investors currently participating in the Plan, will remain enrolled in the Plan, and do not have to take any action unless they wish to terminate participation or change an election in the Plan.

NW Natural’s common stock is listed on the New York Stock Exchange and trades under the ticker symbol “NWN.”

To the extent required by applicable law in certain jurisdictions, shares of common stock offered under the Plan to certain persons are offered only through a registered broker/dealer in such jurisdictions.

NW Natural’s principal executive offices are located at One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209, and its telephone number is (503) 226-4211.


Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.


The date of this prospectus is April     , 2005


TABLE OF CONTENTS WHERE YOU CAN FIND MORE INFORMATION..........................................3 FORWARD-LOOKING STATEMENTS...................................................3

Page

WHERE YOU CAN FIND MORE INFORMATION

3

FORWARD-LOOKING STATEMENTS

3

NW NATURAL

3

THE PLAN

4

Purpose

4

Advantages

4

Disadvantages

4

Other Features

5

Administration

5

Eligibility

6

Participation

7

Dividend Reinvestment

7

Optional Cash Payments

8

Purchases

9

Sales and Termination from the Plan

10

Reports to Participants

11

Certificates

11

Transfer of Shares Held in the Plan

11
Page

Safekeeping Service for Common Stock Certificates

11

Other Information

12

TAX CONSEQUENCES OF PARTICIPATION IN THE PLAN

13

USE OF PROCEEDS

13

DESCRIPTION OF COMMON STOCK

14

General

14

Dividends and Liquidation Rights

14

Dividend Limitations

14

Voting Rights

14

Classification of the Board of Directors

14

Transactions with Related Persons

15

Preemptive Rights

15

Other Provisions

15

Common Share Purchase Rights

15

Certain Anti-Takeover Matters

16

EXPERTS

18


You should rely only on the information incorporated by reference or provided in this prospectus. NW NATURAL...................................................................4 USE OF PROCEEDS..............................................................4 RATIO OF EARNINGS TO FIXED CHARGES AND RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERENCE DIVIDENDS....................................4 DESCRIPTION OF DEBT SECURITIES...............................................5 DESCRIPTION OF THE BONDS.....................................................5 DESCRIPTION OF THE UNSECURED DEBT SECURITIES.................................9 DESCRIPTION OF PREFERRED STOCK..............................................13 DESCRIPTION OF COMMON STOCK.................................................15 PLAN OF DISTRIBUTION........................................................17 EXPERTS.....................................................................18 LEGALITY....................................................................18 2 Natural has not authorized anyone else to provide you with different information. NW Natural is not making an offer of the common stock in any jurisdiction where the offer is not permitted. You should not assume that the information in this prospectus or any supplement is accurate as of any date other than the date on the front of those documents.


WHERE YOU CAN FIND MORE INFORMATION

NW Natural files annual, quarterly and otherspecial reports and other information with the Securities and Exchange Commission (SEC). Reports, proxy statements and other information filed by NW Natural can be read and copied at the public reference room of the SEC, Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549. You can obtain additional information about the Public Reference Room by calling the SEC at 1-800-SEC-0330.

In addition, the SEC maintains a Web site (http://www.sec.gov) that contains reports, proxy statements and other information filed electronically by NW Natural. NW Natural also maintains a Web site (http://www.nwnatural.com). Information contained on NW Natural'sNatural’s Web site does not constitute part of this prospectus.

NW Natural'sNatural’s common stock is listed on the New York Stock Exchange under the symbol "NWN",“NWN” and information concerning NW Natural can also be inspected at the office of that exchange located at 20 Broad Street, New York, New York 10005.

The SEC allows NW Natural to "incorporate“incorporate by reference"reference” the information that NW Natural files with the SEC, which means that NW Natural may, in this prospectus, disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus.prospectus and you should read it with the same care. NW Natural is incorporating by reference the documents listed below and any future filings NW Natural makes with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (Exchange Act), until NW Natural sells all of the securitiescommon stock described in this prospectus. In addition,prospectus, and any filings which NW Natural makes with the SEC after the initial filing date of the registration statement of which this prospectus is a part and prior to the effective date of such registration statement will also be incorporated by reference in the prospectus. However, any information furnished under Items 9 or 12 of any Current Report on Form 8-K shall not be deemed incorporated by reference herein.statement. Information that NW Natural files in the future with the SEC will automatically update and supersede this information. o

NW Natural'sNatural’s Annual Report on Form 10-K for the year ended December 31, 2002. o NW Natural's Quarterly Reports on Form 10-Q2004.

Any statement contained in this prospectus or in a document incorporated or deemed to be incorporated by reference in this prospectus will be deemed to be modified or superseded for the quarters ended March 31, June 30 and September 30, 2003. o NW Natural's Current Reports on Form 8-K filed February 5, 2003, May 1, 2003 (with respectpurposes of this prospectus to the information set forth under Item 5extent that a statement contained in this prospectus or in any separately filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes that statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute part of such report), August 28, 2003 and January 29, 2004 (with respect to the information set forth under Item 5 of such report). this prospectus.

You may request a copy of these documents, at no cost to you, by writing or calling Shareholder Services, Northwest Natural Gas Company, One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209, telephone 503-226-4211. You should rely only on the information contained in, or incorporated by reference in, this prospectus and any prospectus supplement. NW Natural has not, and any underwriters, agents or dealers have not, authorized anyone else to provide you with different information. NW Natural is not, and any underwriters, agents or dealers are not, making an offer of these securities or soliciting offers to buy these securities in any state where the offer or solicitation is not permitted. You should not assume that the information contained in this prospectus and any prospectus supplement is accurate as of any date other than the date on the front of such document or that the information incorporated by reference in this prospectus is accurate as of any date other than the date of the document incorporated by reference.

FORWARD-LOOKING STATEMENTS

This document does, and the documents incorporated herein by reference may, contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (Securities Act), and Section 21E of the 3 Exchange Act. Although NW Natural believes these statements are based on reasonable assumptions, no assurance can be given that actual results will not differ from those in the forward-looking statements contained herein and in the incorporated documents. The forward-looking statements contained herein and in the incorporated documents may be affected by various uncertainties. For a discussion of factors which may affect forward-looking statements contained herein and in the incorporated documents, see NW Natural'sNatural’s most recent Annual Report on Form 10-K and its most recent Quarterly Report on Form 10-Q.

NW NATURAL

NW Natural is principally engaged in the distribution of natural gas to customers in western Oregon and southwestern Washington, including the Portland metropolitan area. NW Natural and its predecessors have supplied gas service to the public since 1859. NW Natural'sNatural’s executive offices are located at One Pacific Square, 220 N.W. Second Avenue, Portland, Oregon 97209. Its telephone number is 503-226-4211. USE

THE PLAN

DESCRIPTION OF PROCEEDS THE PLAN

The net proceedsprovisions of the Plan in effect on and after the date hereof are presented in the following questions and answers.

Purpose

1. WHAT IS THE PURPOSE OF THE PLAN?

The Plan provides interested investors with a convenient method of purchasing NW Natural’s common stock directly through the Plan administrator and provides current shareholders with a convenient method of investing cash dividends on their NW Natural shares in additional shares of common stock. At NW Natural’s option, shares purchased under the Plan will be (a) authorized but unissued shares purchased directly from NW Natural, (b) shares purchased in the open market or in privately negotiated transactions, or (c) any combination of the foregoing. When shares purchased under the Plan are acquired directly from NW Natural, NW Natural will receive additional equity funds which will be added to its general funds and used for its continuing construction program and general corporate purposes as described in “Use of Proceeds.”

Advantages

2. WHAT ARE THE ADVANTAGES OF THE PLAN?

Investors who are not shareholders may enroll in the Plan by making an initial cash investment of at least $250.

Participants in the Plan may elect to have cash dividends on all or a portion of the shares of common stock registered in their names (Registered Shares) and all cash dividends on shares of common stock in their Plan accounts (Plan Shares) automatically reinvested. All shares purchased under the Plan will be credited to and, unless otherwise requested, held in participant’s accounts under the Plan. Remaining cash dividends on Registered Shares or all cash dividends on all of the participant’s shares, whether Registered Shares or Plan Shares, will be paid to participants by check or through electronic direct deposit.

Participants in the Plan may make optional cash payments (including payments made by authorizing direct debit from their personal bank accounts), after the initial investment, of up to a maximum amount of $100,000 per calendar year. Participants in the Plan may continue to receive their cash dividends on Registered Shares and on Plan Shares, if designated, and invest by making such optional cash payments.

Full investment of funds is possible under the Plan because both full and fractional shares will be credited to participants’ Plan accounts.

Participants may enroll and manage their Plan accounts through the Agent’s website at http://www.amstock.com.

Personal recordkeeping is simplified by the issuance of statements showing account activity. Statements of account are a participant’s continuing record of transactions and should be retained for tax purposes.

Participants may sell shares of common stock held or deposited in their Plan accounts.

Disadvantages

3. WHAT ARE THE DISADVANTAGES OF THE PLAN?

A participant will have no control over the prices at which shares are purchased or sold for his or her account, because:

purchases for the participant’s account will be made during periods prescribed under the Plan. See Questions 10 and 15; and

participants cannot designate a specific price or a specific date at which to sell shares or select the broker through which sales will be made. See Question 20.

Therefore, the participant will bear the risk of fluctuations in the market price of NW Natural’s common stock.

A participant will not receive any interest on dividends or optional cash payments held by the Plan administrator before the investment date.

In the event that shares purchased under the Plan will be purchased in the open market or in privately negotiated transactions, participants in the Plan will pay a pro rata share of any brokerage fees and transaction costs incurred in connection with purchases of shares.

Other Features

4. WHAT ARE OTHER FEATURES OF THE PLAN?

Non-shareholders of legal age may participate in the Plan by making a minimum initial cash investment of $250 to purchase NW Natural’s common stock under the terms of the Plan.

For each meeting of shareholders, participants will receive proxies that will enable them to vote both Registered Shares and Plan Shares.

Administration

5. WHO ADMINISTERS THE PLAN?

By participating in the Plan, each participant designates American Stock Transfer & Trust Company (AST) (or a successor thereto) as his or her Agent under the Plan. The Agent will administer the Plan, receive and hold participants’ funds pending investment in additional shares of common stock, effect transfers of common stock, keep a continuous record of participation and prepare and send to each participant statements of the participant’s Plan account. Shares purchased under the Plan will be registered in the name of the Agent (or its nominee) and held by the Agent for each participant in the Plan. In the event that AST ceases to act as the Plan administrator, NW Natural will appoint a new Plan administrator to act as Agent and administer the Plan.

The Agent will use a broker-dealer registered under the Securities Exchange Act of 1934 (Purchasing Representative) to act as an independent agent on behalf of Plan participants in purchasing and selling shares for participants in the open market or in privately negotiated transactions. Subject to the objective of obtaining the lowest over-all costs of shares purchased, the Purchasing Representative will have full discretion as to all matters relating to purchases of shares.

The law in some jurisdictions requires NW Natural to offer shares through this Plan only through a registered broker/dealer. In those instances, the Purchasing Representative will also act as the registered broker/dealer.

NW Natural reserves the right to interpret and administer the Plan as deemed necessary or desirable, including the right to limit or deny participation in the Plan where circumstances warrant. The terms and conditions of the Plan and its operation shall be governed by and construed in accordance with the laws of the State of Oregon. None of NW Natural, AST, or its Purchasing Representative will be liable for any act done in good faith or for any omission to act in good faith, provided that NW Natural shall not be relieved from any liability imposed under any federal, state or other applicable securities law which cannot be waived. You should recognize that NW Natural cannot assure you of a profit or protect you against a loss on shares purchased or sold under the Plan. A participant participates in the Plan at his or her sole discretion, risk and responsibility.

6. WHO SHOULD I CONTACT WITH QUESTIONS CONCERNING THE PLAN AND ITS ADMINISTRATION?

Participants may contact the Agent:

by writing to:

For inquiries:

For transaction processing:

American Stock Transfer & Trust Company

American Stock Transfer & Trust Company

59 Maiden Lane

P.O. Box 922

Plaza Level

Wall Street Station

New York, NY 10038

New York, NY 10269-0560

by calling 1-888-777-0321 from 8 a.m. to 7 p.m. ET, Monday through Thursday, and 8 a.m. to 5 p.m. ET, Friday. The interactive voice response is available 24 hours a day, 7 days per week.

by email atinfo@amstock.com, or

by visiting the Agent’s website athttp://www.amstock.com.

Existing shareholders may log into their accounts atwww.amstock.com by clicking on “Shareholder Account Access” and following the instructions.

Non-shareholders may enroll in and purchase shares under the Plan atwww.amstock.com by clicking on “Invest Online” and following the instructions.

7. MAY THE PLAN BE SUSPENDED, MODIFIED OR DISCONTINUED?

The Board of Directors of NW Natural reserves the right to amend, suspend, modify or terminate the Plan at any time, including, but not limited to, the right to modify the fees and commissions charged to participants. Notice of any such amendment, suspension, major modification or termination of the Plan would be provided to all participants.

Eligibility

8. WHO IS ELIGIBLE TO PARTICIPATE IN THE PLAN?

The Plan is available to any person of legal age or entity, whether or not a holder of NW Natural’s common stock, provided that such person or entity fulfills the prerequisites for participation described under Question 9 and participation would not violate the securities or other laws of the state, territory or country where the participant resides that are applicable to NW Natural, the Plan or the participant. Shares for which dividends are reinvested by the Plan must be Registered Shares or Plan Shares. Beneficial owners of NW Natural common stock are owners whose shares are held in a brokerage account by a bank, broker or other custodial institution in “street name.” In order to participate in the Plan, such beneficial owners must request the bank, broker or other custodial institution to have such shares registered in the owner’s name. Alternatively, such beneficial owners may participate in the Plan indirectly by requesting the bank, broker or custodial institution to participate on the owner’s behalf.

In certain jurisdictions, applicable laws require NW Natural to use a registered broker-dealer to offer common stock under the Plan to persons not presently shareholders of record. No offers or sales will be effected in those jurisdictions unless NW Natural has satisfied the requirements of the state securities laws applicable to the operation of the Plan. To the extent required by applicable law in certain jurisdictions, NW Natural will offer shares of common stock under the Plan to persons not presently shareholders of record of common stock only through a registered broker/dealer in those jurisdictions. The Agent will select a registered broker/dealer through whom NW Natural will offer shares in those instances and for all Plan trading activity.

A Plan prospectus and enrollment or application information will be furnished upon request made to the Agent or it may be obtained from the Agent’s website at http://www.amstock.com.

Participation

9. HOW DO I ENROLL IN THE PLAN OR CHANGE MY METHOD OF PARTICIPATION?

Current participants will automatically be participants in the Plan as amended to date, and need do nothing to continue their participation.

After receiving a copy of this prospectus, shareholders may become participants in the Plan by completing and signing an enrollment card (Enrollment Card) and non-shareholders may become participants by completing and signing an application (Application).

An Enrollment Card or Application may be obtained by contacting the Agent at 1-888-777-0321 or by visiting their website atwww.amstock.com and downloading the forms.

The Enrollment Card and Application require a participant to choose a reinvestment option for participation in the Plan. By checking the appropriate box a participant may select:

Full Dividend Reinvestment—Automatic reinvestment of cash dividends on all of the participant’s shares of common stock. Participant will also be entitled to invest optional cash payments in additional shares.

Partial Dividend Reinvestment—Receipt of cash dividends on a portion of the Registered Shares credited to the participant’s account, and automatic reinvestment of the cash dividends on the remainder of the participant’s shares. Participant will also be entitled to invest optional cash payments in additional shares.

Optional Cash Purchases Only—Cash dividends on all Registered Shares and Plan Shares will be paid to participants by check or through electronic deposit. The amount of optional cash payments which may be made by a participant may not exceed $100,000 per calendar year. Dividends on all shares purchased with optional cash payments will be Plan Shares and will be reinvested in additional shares unless and until a participant requests that the Plan Shares be registered in the participant’s name.

Under any of the investment options, a participant may make optional cash investments of a minimum of $25 (or a minimum of $250 for the initial investment by a non-shareholder) and a maximum of $100,000 per calendar year (including the initial investment) towards the purchase of additional shares of common stock.

If participants do not indicate an investment option on the enrollment form, their account will automatically be enrolled in the “Full Dividend Reinvestment” option.

Participants may change their reinvestment options by completing the tear-off portion of their Investment Statement of account or an enrollment form and sending it to the Agent. Changes will become effective as soon as practicable after they are received. Any change in reinvestment options must be received by the dividend record date (see Question 10, below) in order to be effective on the related payment date.

Dividend Reinvestment

10. HOW AND WHEN WILL CASH DIVIDENDS BE REINVESTED?

Each cash dividend payment date on the common stock will be an Investment Date under the Plan; which means that, for participants who choose to reinvest dividends, the dividend payments on such payment date will be used to purchase additional shares of common stock as of such payment date. Common stock cash dividend payment dates are ordinarily the fifteenth day of February, May, August and November and corresponding record dates normally precede payment dates by 15 days.

If NW Natural is meeting the requirements of the Plan with common stock purchased in the open market or in privately negotiated transactions, the Purchasing Representative will determine the exact timing of such purchases and the number of shares to be purchased, depending on the amount of reinvested dividends, market conditions and the requirements of federal securities laws, and the purchased shares will be credited to a participant’s Plan account as of the applicable Investment Date. If NW Natural elects to issue authorized but unissued shares of common stock directly to the Agent, these shares will be issued by NW Natural and credited to a participant’s Plan account as of the applicable Investment Date. The determination of the price for purchases of Plan Shares is explained in Question 17. In any case, dividends not invested in shares of common stock within 30 days of the dividend payment date will be returned, without interest, to the participant.

If a participant’s Enrollment Card is received by the Agent on or before the record date for a dividend payment, the dividend payable on such Investment Date will be used to purchase additional shares of common stock as of such Investment Date, unless the Enrollment Card indicates “Optional Cash Purchases Only.” If the Enrollment Card is received after the record date for any such cash dividend payment date, the reinvestment of dividends will start with the next dividend payment date. If a certificate representing Registered Shares to be deposited for safekeeping, together with a completed Safekeeping Authorization Instruction, is received on or before the record date for a dividend payment, reinvestment of dividends on such shares will begin with that dividend. If such certificate and Instruction are received after the record date for a dividend payment, reinvestment of dividends will begin with the next dividend payment date unless a participant already has elected “Full Dividend Reinvestment” for such shares.

For example, a dividend payable February 15 will be reinvested if a completed Enrollment Card, or a certificate and a completed Safekeeping Authorization Instruction, is received by the Agent on or before the record date of January 31. If the Enrollment Card, or such certificate and Instruction, is received after January 31, but on or before the record date for the next dividend payment, the first dividend reinvested will be the dividend payable May 15.

Optional Cash Payments

11. WHO IS ELIGIBLE TO MAKE OPTIONAL CASH PAYMENTS?

All Plan participants, whether or not they have authorized the reinvestment of dividends, are eligible to make optional cash payments.

12. HOW ARE OPTIONAL CASH PAYMENTS MADE?

A Plan participant may make an initial cash investment when enrolling by enclosing a check or money order with the Enrollment Card or Application. Checks should be made payable to “American Stock Transfer & Trust Co.” and returned to the address specified or in the envelope provided. Thereafter, optional cash payments may be made by using the cash payment form attached to the statement of account, or through the Automatic Monthly Deduction Form (see Question 13). If a participant uses the cash payment form, the same amount of money need not be sent each month and there is no obligation to make an optional cash purchase each month.

13. WHAT IS THE AUTOMATIC MONTHLY DEDUCTIONS PROGRAM AND HOW DOES IT WORK?

The Plan offers a program which allows participants to make optional cash purchases by authorizing automatic payments from bank accounts designated by the participants. Payments made through this method which must be the same amount each month as designated by the participant, are deducted on or about the 10th of each month and are invested on the 15th of each month. For an Automatic Monthly Deduction Form, please contact the Agent.

14. WHAT ARE THE LIMITATIONS ON MAKING OPTIONAL CASH PAYMENTS?

There is a $25 minimum amount required for optional cash payments by shareholders, except as provided in Question 20. In case of an initial optional cash payment by a non-shareholder, such optional cash payments

cannot be less than $250. The maximum aggregate optional cash payment that may be made by a participant in any calendar year cannot exceed $100,000.

15. WHEN WILL OPTIONAL CASH PAYMENTS BE INVESTED?

Investment Dates for optional cash payments will occur monthly, usually on the 15th day of each month. Purchases may be made over a period of several days in the case of market purchases. All such purchases will be aggregated and credited to participants’ accounts on the Investment Date occurring on or after receipt of the optional cash payment.

The Agent must receive optional cash payments at least three business days prior to an Investment Date to be invested on that Investment Date. Otherwise, the Agent will hold the optional cash payments for investment until the next Investment Date. Optional cash payments which remain uninvested more than 35 days following receipt by the Agent will be returned, without interest, to the participant. Optional cash payments received by the Agent will be returned to the participants upon written request received by the Agent at least three business days prior to the Investment Date following their receipt. No interest will be paid by NW Natural or the Agent on any cash investments received by the Agent pending investment.

Purchases

16. HOW MANY SHARES OF COMMON STOCK WILL BE PURCHASED?

The number of shares to be purchased under a Plan depends on the amount of a participant’s funds available for investment and the price of the shares. The funds available for investment depend on what has been authorized in regard to dividend reinvestment, plus any optional cash payments made. In every case, available funds will be fully invested in both whole and fractional shares of common stock (computed to three decimal places). No one can predict the number of shares that will be purchased for Plan participants during a particular purchase period, and Plan participants cannot direct the purchase of a specific number of shares.

17. WHAT IS THE PRICE OF SHARES PURCHASED FOR THE PLAN?

If the Agent purchases authorized but unissued shares of common stock directly from NW Natural, the price of such shares will be the average of the high and low sales prices of NW Natural’s common stock on the trading day preceding the applicable Investment Date reported on the consolidated tape for the NYSE listed companies administered by the Consolidated Tape Association.

The purchase price of shares purchased in respect of any Investment Date on the NYSE or through privately negotiated transactions will be the average price (including brokerage fees) paid by the Purchasing Representative to obtain them.

The Purchasing Representative may offset purchases of shares against sales of shares to be made for participants under the Plan with respect to an Investment Date, resulting in a net purchase or a net sale of shares.

18. WHO PURCHASES THE SHARES FOR THE PLAN?

NW Natural, at its discretion, may elect to satisfy the requirements of the Plan with either (i) authorized but unissued shares of common stock, (ii) shares of common stock purchased in the open market or in privately negotiated transactions, or (iii) any combination of the foregoing. If NW Natural elects to purchase shares of common stock in the open market or in privately negotiated transactions, the Purchasing Representative will make all such purchases necessary to meet the requirements of the Plan. Shares purchased in any month on the NYSE or through privately negotiated transactions will be purchased, at the discretion of the Purchasing Representative, during the period beginning on the third trading day prior to the Investment Date for that month and typically ending by the fifth trading day after the Investment Date. Other than establishing the length of any such investment period incorporated into the Plan, NW Natural does not exercise any direct or indirect control over the timing or price of purchases made by the Purchasing Representative.

19. ARE ANY FEES OR EXPENSES INCURRED BY PARTICIPANTS?

In most cases, NW Natural will pay the fees and expenses to operate the Plan. However, there are some service fees and brokerage commissions which will be charged directly to participants. Participants will incur no broker fees, commissions or other charges for authorized but unissued shares purchased directly from NW Natural. Participants in the Plan will bear the cost of brokerage fees and commissions, any service charges and applicable taxes related to shares purchased or sold on the open market or in privately negotiated transactions.

A service fee of up to $30 will be assessed for each item that is returned for insufficient funds. The Agent may place a hold on the account until the “insufficient funds” fee is received, sell shares from the account to collect the “insufficient funds” fee, or withhold the amount of the “insufficient funds” fee from future optional cash investments.

See Question 24 for fees associated with Safekeeping and Question 20 for service fees associated with the sale of shares.

NW Natural reserves the right at any time to change fees or to charge participants (including those who do not reinvest dividends) other fees, including but not limited to administrative, setup and handling fees. Notice of such future changes or additional fees will be sent to participants at least 30 days prior to their effective date.

Sales and Termination from the Plan

20. MAY PARTICIPANTS SELL OR WITHDRAW ALL OR A PORTION OF THEIR SHARES FROM THE

PLAN?

Yes. Any participant may withdraw from the Plan, request that a certificate be issued for Plan Shares or request that all or a portion of the whole Plan Shares be sold and that the cash proceeds, less any fees discussed below, be forwarded to the participant. Participation in the Plan is entirely voluntary. In order to withdraw shares from the Plan, a participant must notify the Agent either in writing by using the transaction request form attached to the bottom of the statement or through the website atwww.amstock.com that the participant wishes to withdraw.

A stock certificate for any whole number of shares may be issued from a Plan account as soon as practicable after it is requested by a participant or upon termination of the Plan by NW Natural. Certificates for whole shares withdrawn from the Plan will be registered under the name in which the participant’s certificates were registered upon entering the Plan. A cash payment will be made for any fraction of a share.

Except as otherwise provided in the following paragraph, any sale of whole shares will be made within two business days after receipt of the request by the Agent. The participant will receive the proceeds of the sale less a service charge of $15, and any applicable brokerage fees or commissions and any withholding required under applicable tax laws, from the sale of these securitiesthe whole shares sold at the participant’s request and a cash payment for any fraction of a share credited to the participant’s account.

A participant may withdraw from the Plan at any time if notice is received at least three days prior to a payable date, in such case the dividend will be paid in cash. If a participant’s request is received less than three days prior to the payable date, then the immediate dividend will be reinvested and all subsequent dividends will be paid in cash.

If a participant disposes of all Registered Shares, NW Natural, at its option, either may treat such disposal as a notice of withdrawal or may continue to reinvest the dividends on Plan Shares.

Reports to Participants

21. HOW WILL PARTICIPANTS BE ADVISED OF THEIR PURCHASE OF SHARES OF COMMON STOCK AND OTHER ACTIVITY IN THEIR PLAN ACCOUNTS?

As soon as practicable after purchases for their accounts, statements will be mailed to participants advising them of their investments. The statements are participants’ continuing record of the cost of their purchases and should be retained for income tax purposes. In addition, participants will receive copies of the same communications sent to every other holder of shares of common stock, including NW Natural’s annual report, notice of annual meeting and proxy statement, and income tax information form reporting dividends paid.

Certificates

22. WILL STOCK CERTIFICATES AUTOMATICALLY BE ISSUED FOR SHARES OF COMMON STOCK ACQUIRED UNDER THE PLAN?

No. Unless requested otherwise as described below or the account is terminated, the number of shares purchased under the Plan and any shares deposited with the Agent for safekeeping will be held by the Agent or its nominee for the participants. At any time, a participant may request the Agent to send him a certificate for any whole shares credited to the participant’s account. Any remaining whole shares and fraction of a share will continue to be credited to the participant’s account. This service protects against loss, theft or destruction of stock certificates.

Certificates for fractional shares will not be issued under any circumstances.

Shares credited to Plan accounts may not be used as collateral. To use Plan shares as collateral, participants must request that a certificate be issued in their name.

A participant’s Plan account is maintained in the same name in which the participant’s certificates were registered when he or she entered the Plan or if a participant enrolled in the Plan directly, the account is maintained in the name as shown on NW Natural’s records at the time the participant enrolled.

Transfer of Shares Held in the Plan

23. CAN PLAN SHARES BE TRANSFERRED?

Upon written request, Plan shares can be transferred into names other than the account name, subject to compliance with any applicable laws and the payment by the participant of any applicable taxes, provided that the request is accompanied by a duly executed stock power that bears the signature(s) of the participant(s) and the signature(s) is/are Medallion Guaranteed by a financial institution, such as a commercial bank or a brokerage firm, that is a member of either the STAMP, SEMP or MSP Medallion Guarantee programs. Unless instructed otherwise, the Agent will hold the transferred shares in an account in the transferee’s name in the Plan and apply the same dividend reinvestment options as existed with respect to the transferred account.

Safekeeping Service for Common Stock Certificates

24. WHAT IS THE PLAN’S SAFEKEEPING SERVICE AND HOW DOES IT WORK?

A participant may elect to deposit Registered Shares into his or her Plan account for safekeeping as Plan Shares. Any lost certificates must be replaced before a participant may deposit the shares represented by such certificate.

Certificates representing Registered Shares to be deposited for safekeeping should be sent, together with a completed Safekeeping Authorization Instruction, by registered mail to the Agent. Certificates should not be endorsed. A Safekeeping Authorization Instruction may be obtained from the Agent at any time. The participant will incur a service fee of $7.50 for the handling of each safekeeping request.

It is suggested that participants use registered mail when sending stock certificates, declaring a value equal to 2% of the market value of the shares on the date of mailing. This amount would be the approximate cost of replacing the certificates should they be lost in the mail.

It is the responsibility of the participant to retain his or her records relative to the cost of any shares represented by certificates deposited for safekeeping.

Other Information

25. HOW IS PARTICIPATION BY FOREIGN AND OTHER HOLDERS SUBJECT TO WITHHOLDING DIFFERENT?

In the case of foreign holders of common stock whose dividends are subject to United States income tax withholding or other holders of common stock whose dividends are subject to United States back-up withholding there will be reinvested an amount equal to the dividends less the amount of tax required to be withheld. Statements confirming purchases made for such participants will indicate the net dividend reinvested and the amount of tax withheld.

Foreign shareholders who check the “Optional Cash Payments Only” box on the Enrollment Card will continue to receive cash dividends on Registered Shares in the same manner as if they were not participating in the Plan. Optional cash payments received from them must be in United States dollars and will be invested the same way as payments from other participants.

26. WHAT HAPPENS IF NW NATURAL ISSUES A STOCK DIVIDEND OR DECLARES A STOCK SPLIT?

Any dividend payable in stock or split shares distributed by NW Natural on Plan Shares, both full and fractional, will be credited to the participant’s account. Such stock dividends or split shares distributed on Registered Shares will be mailed directly to the participant in the same manner as to the shareholders who are not participating in the Plan.

Transaction processing may be curtailed or suspended until the completion of any stock dividend, stock split or other corporate action.

27. HOW WILL A PARTICIPANT’S PLAN SHARES BE VOTED AT A MEETING OF SHAREHOLDERS?

Participants will be sent notices of meetings, proxy statements and proxy forms for each shareholder’s meeting. Plan Shares, including fractional Plan Shares, will be voted as the participant directs. Registered Shares will be voted directly by the participant.

The proxy card sent to each participant in connection with any annual or special meeting of shareholders will represent all Registered Shares, if any, and all Plan Shares owned by such participant.

As in the case of non-participating shareholders, if no instructions are indicated on the properly signed and returned proxy card, all of the participant’s shares—Registered Shares, if any, and Plan Shares—will be voted in accordance with the recommendations of NW Natural. If the proxy card is not returned or if the participant does not grant a proxy by voting by telephone or the Internet, the participant’s shares may be voted only if the participant or a duly appointed representative votes in person at the meeting.

28. WHAT ARE NW NATURAL’S AND THE AGENT’S RESPONSIBILITIES UNDER THE PLAN?

Neither NW Natural nor the Agent administering the Plan will be liable for any act done in good faith or for any good faith omission to act including, without limitation, any claim of liability arising out of failure to terminate a participant’s account upon such participant’s death or with respect to the prices at which shares of common stock are purchased or sold for the participant’s account and the times when such purchases or sales are made or with respect to any fluctuation in the market value after the purchase or sale of shares.

Participants should recognize that NW Natural cannot assure a profit or protect against a loss on the shares purchased or sold under the Plan.

TAX CONSEQUENCES OF PARTICIPATION IN THE PLAN

With respect to reinvested cash dividends used to purchase authorized but unissued shares from NW Natural, a participant will be treated for Federal income tax purposes as having received a distribution in an amount equal to the fair market value on the dividend payment date of the full number of shares and fractional shares purchased with reinvested dividends. The fair market value of such shares on the dividend payment date will be treated as dividend income to the participant to the extent of the current and accumulated earnings and profits of NW Natural, as determined for Federal income tax purposes. The basis of the shares so purchased will be equal to the fair market value of such shares on the dividend payment date.

With respect to reinvested cash dividends used to purchase shares in the open market or through privately negotiated transactions, a participant will be treated for Federal income tax purposes as having received a distribution in an amount equal to the cash reinvested to obtain the shares. The cash reinvested will be treated as dividend income to the participant to the extent of the current and accumulated earnings and profits of NW Natural, as determined for Federal income tax purposes. The basis of the shares so purchased will be equal to the amount of this distribution.

A participant who purchases shares with optional cash payments will recognize no taxable income upon such purchases. The basis of shares purchased in this manner will be the amount of the optional cash payment.

A participant will not realize any taxable income upon the distribution to him of certificates for whole shares credited to his or her account. However, gain or loss will be realized by the participant when whole and fractional shares are sold pursuant to the participant’s request to sell shares held in the Plan and when whole shares are sold by the participant. A participant who receives on termination of participation or on termination of the Plan by NW Natural a cash adjustment for a fraction of a share credited to such participant’s account will realize gain or loss with respect to such fraction. Gain or loss will be measured by the difference between the amount the participant receives and his or her tax basis for the shares, or fraction of a share, sold. Such shares will normally constitute capital assets in the hands of a participant and gain or loss on their sale will constitute long- or short-term capital gain or loss depending on the period for which the shares shall be held.

The foregoing tax information is provided solely as a general guide to participants. Therefore, participants are advised to consult their own tax advisors as to the Federal and State income tax effect of participation in the Plan.

USE OF PROCEEDS

To the extent that authorized but unissued shares are purchased under the Plan from NW Natural, the net proceeds from their sale will be added to theNW Natural’s general funds of NW Natural and will be used for corporate purposes, primarily to fund,finance in part NW Natural's ongoingits continuing utility construction program.program and for general corporate purposes. NW Natural expects its utility construction expenditures in 20042005 to aggregate $165be $104 million, and in the five-year period, 2004-2008, to aggregatebe between $500 million and $600 million. It is estimated that 60% of

During the funds required for corporate purposes during the 2004-200812-month period will be internally generated and that the balance, as well as substantially all of the funds required for the refinancing of maturing debt, will be raised through the sale of equity and debt securities in such amounts and at such times asended December 31, 2004, NW Natural's cash requirements and market conditions shall determine. RATIO OF EARNINGS TO FIXED CHARGES AND RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERENCE DIVIDENDS The ratios of earnings to fixed charges and ratios of earnings to combined fixed charges and preference dividends, calculated according to the rules set forthNatural sold 157,124 authorized but unissued shares under the Securities Act, for the following periods were:
RATIO OF EARNINGS RATIO OF TO COMBINED FIXED PERIOD EARNINGS TO CHARGES AND PREFERENCE FIXED CHARGES DIVIDENDS - ------------------------------------------------------------------------------------ Nine Months Ended September 30, 2003* 2.29 2.27 Year Ended December 31, 2002 2.85 2.74 Year Ended December 31, 2001 3.14 3.01 Year Ended December 31, 2000 3.14 3.00 Year Ended December 31, 1999 3.12 2.97 Year Ended December 31, 1998 2.20 2.12
Earnings consist of net income to which has been added taxes on income and fixed charges. Fixed charges consist of interest on all indebtedness, amortization of debt expense and discount or premium, and the estimated interest portion of rentals charged to income. Preference dividends are the amounts of pre-tax earnings that are required to pay dividends on outstanding preference securities (which may include any NW Natural preferred and/or preference stock outstanding for the period). - ------- * A significant part of the businesses of NW Natural is seasonal in nature; therefore, the ratio of earnings to fixed charges and the ratio of earnings to combined fixed charges and preference dividends for the interim period are not necessarily indicative of the resultsPlan for a full year. 4 total consideration of $4,823,856.

DESCRIPTION OF DEBT SECURITIES GENERAL The following sections set forth certain general terms and provisions of NW Natural's secured and unsecured debt securities, consisting of first mortgage bonds and debentures, notes or other debt, that NW Natural may offer by this prospectus. NW Natural will describe the particular terms of the debt securities, and provisions that vary from those described below, in one or more prospectus supplements. DESCRIPTION OF THE BONDS GENERAL NW Natural will issue its first mortgage bonds, in one or more series, under the Mortgage and Deed of Trust, dated as of July 1, 1946, to Deutsche Bank Trust Company Americas (formerly known as Bankers Trust Company)(the Corporate Trustee) and Stanley Burg (successor to R.G. Page and J.C. Kennedy), as trustees (together, Mortgage Trustees), which has been amended and supplemented in the past and which may be supplemented again by one or more supplemental indentures relating to these securities. This Mortgage and Deed of Trust, as amended and supplemented, is referred to in this prospectus as the "Mortgage." These first mortgage bonds offered by this prospectus are referred to in this prospectus as the "Bonds." All first mortgage bonds issued or to be issued under the Mortgage, including the Bonds, are referred to herein as "First Mortgage Bonds." This section briefly summarizes some of the provisions of the Bonds and some of the provisions of the Mortgage and uses some terms that are not defined in this prospectus but that are defined in the Mortgage. This summary is not complete. The Mortgage is on file with the SEC and is incorporated by reference in this prospectus. You should read the Mortgage for a complete understanding of the provisions that may be important to you and for the definitions of some terms used in this summary. Each series of Bonds may have different terms. NW Natural will include some or all of the following information about a specific series of Bonds in the prospectus supplement relating to those Bonds: o the designation of the series and the aggregate principal amount of those Bonds, o the interest rate(s) for those Bonds, o the currency or currencies in which payment of the principal of and interest on those Bonds may be made, o the date(s) on which those Bonds will mature, o the dates on which NW Natural will pay the interest on those Bonds and the date from which interest will accrue, o the place(s) where the principal of and interest on those Bonds will be payable, o whether all or any portion of those Bonds will be issued to a designated depositary, o the additional place(s) for the payment of principal or interest or for the registration or transfer of those Bonds, o any terms or obligations of NW Natural relating to creation of a sinking fund with respect to those Bonds or permitting conversion of those Bonds into capital stock of the Company or another entity, o any terms permitting bondholders to exchange those Bonds for other securities, 5 o any terms pursuant to which NW Natural may redeem any of those Bonds, and o any other terms or provisions relating to those Bonds that are not inconsistent with the provisions of the Mortgage. FORM, EXCHANGE AND PAYMENT Unless otherwise specified in the prospectus supplement relating to the Bonds, the Bonds will be (1) issued in fully registered form in denominations of $1,000 or any amount in excess thereof that is an integral multiple of $1,000 and (2) exchangeable at the office of Deutsche Bank Trust Company Americas in New York City, without charge other than taxes or other governmental charges incident thereto, and principal, premium, if any, and interest will be payable at such office. PROVISIONS FOR MAINTENANCE OF PROPERTY While the Mortgage contains provisions for the maintenance of the Mortgaged and Pledged Property, the Mortgage does not permit redemption of Bonds pursuant to these provisions. SECURITY First Mortgage Bonds issued or to be issued under the Mortgage are or will be secured by the Mortgage, which constitutes a first mortgage lien on certain gas utility properties owned from time to time by NW Natural (except as stated below), subject to Excepted Encumbrances, including minor defects and irregularities customarily found in properties of similar size and character. There are excepted from the lien: (1) cash and securities, (2) certain equipment, apparatus, materials or supplies, (3) aircraft, automobiles and other vehicles, (4) receivables, contracts, leases and operating agreements, (5) timber, minerals, mineral rights and royalties, and (6) all Natural Gas and Oil Production Property. The Mortgage contains provisions that impose the lien of the Mortgage on property acquired by NW Natural after the date of the Mortgage, other than the excepted property described above and subject to pre-existing liens. However, if NW Natural consolidates, merges or sells substantially all of its assets to another corporation, the lien created by the Mortgage will generally not cover the property of the successor corporation, other than the property it acquires from NW Natural and improvements, extensions, additions, renewals and replacements of that property. (See Mortgage, Article XVI.) The Mortgage provides that the Mortgage Trustees shall have a lien upon the mortgaged property, prior to that of the First Mortgage Bonds, for the payment of their reasonable compensation and expenses and for indemnity against certain liabilities. This lien takes priority over the lien securing the First Mortgage Bonds. (See Mortgage, Section 96.) ISSUANCE OF ADDITIONAL FIRST MORTGAGE BONDS First Mortgage Bonds may be issued from time to time on the basis of: 6 (1) 60% of property additions, after adjustments to offset retirements (See "Modification of the Mortgage -- Issuance of Additional First Mortgage Bonds" below), (2) the retirement of First Mortgage Bonds or qualified lien bonds, or (3) the deposit of cash. With certain exceptions in the case of (2) above, the issuance of First Mortgage Bonds must meet an earnings test. The adjusted net earnings before income taxes for 12 consecutive months out of the preceding 15 months must be at least twice the annual interest requirements on all First Mortgage Bonds at the time outstanding, including the additional issue, and all indebtedness of prior rank. Property additions generally include gas, electric, steam or hot water property or gas by-product property acquired after March 31, 1946, but may not include securities, airplanes, automobiles or other vehicles, or natural gas transmission lines or Natural Gas and Oil Production Property. As of September 30, 2003, approximately $457 million of property additions were available for use as the basis for the issuance of First Mortgage Bonds. As of September 30, 2003, approximately $193 million of retired First Mortgage Bonds were available for use as the basis for the issuance of First Mortgage Bonds. The Mortgage contains certain restrictions upon the issuance of First Mortgage Bonds against property subject to liens. The Bonds will be issued against property additions and/or retired First Mortgage Bonds. (See Mortgage, Sections 4-7, 20-30 and 46, and Third Supplemental Indenture, Sections 3 and 4.) RELEASE AND SUBSTITUTION OF PROPERTY Property may be released on the basis of: (1) the deposit of cash or, to a limited extent, purchase money mortgages, (2) property additions, or (3) the waiver of the right to issue First Mortgage Bonds on the basis of retired First Mortgage Bonds, in each case without applying any earnings test. Cash so deposited as the basis for a release and cash deposited as the basis for the issuance of additional First Mortgage Bonds may be withdrawn upon the bases stated in (2) and (3) above without applying an earnings test. When property released is not funded property, property additions used to effect the release may again, in certain cases, become available as credits under the Mortgage, and the waiver of the right to issue First Mortgage Bonds to effect the release may, in certain cases, cease to be effective as such a waiver. Similar provisions are in effect as to cash proceeds of such property. The Mortgage contains special provisions with respect to qualified lien bonds pledged and the disposition of moneys received on pledged prior lien bonds. (See Mortgage, Sections 5, 31, 32, 37, 46 to 50, 59 to 61, 100 and 118.) SATISFACTION AND DISCHARGE OF MORTGAGE The lien of the Mortgage may be canceled and discharged whenever all indebtedness secured by the Mortgage has been paid. First Mortgage Bonds, or any portion of the principal amount thereof, will, prior to the maturity thereof, be deemed to have been paid for purposes of satisfying the lien of the Mortgage and shall not be deemed to be outstanding for any other purpose of the Mortgage if there shall have been deposited with the Corporate Trustee either: 7 (1) moneys in the necessary amount, or (2) (a) direct obligations of the government of the United States of America, or (b) obligations guaranteed by the government of the United States of America, or (c) securities that are backed by obligations of the government of the United States of America as collateral under an arrangement by which the interest and principal payments on the collateral generally flow immediately through to the holder of the security, which in any case are not subject to redemption prior to maturity by anyone other than the holders, and the principal of and the interest on which when due, and without any regard to reinvestment thereof, shall be sufficient to pay when due the principal of, premium, if any, and interest due and to become due on said First Mortgage Bonds or portions thereof on the redemption date or maturity date thereof, as the case may be. (See Mortgage, Section 106 and Thirteenth Supplemental Indenture, Section 3.02.) DEFAULTS AND NOTICE THEREOF Defaults are: (1) default in payment of principal, (2) default for 60 days in payment of interest or of installments of funds for the retirement of First Mortgage Bonds, (3) certain defaults with respect to qualified lien bonds, (4) certain events in bankruptcy, insolvency or reorganization, and (5) default for 90 days after notice in the case of a breach of certain other covenants. The Mortgage Trustees may withhold notice of default (except in payment of principal, interest or any fund for the retirement of First Mortgage Bonds) if they think it is in the interest of the bondholders. (See Mortgage, Sections 65 and 66.) Holders of 25% of the First Mortgage Bonds may declare the principal and the interest due on default, but a majority may annul such declaration if such default has been cured. No holder of First Mortgage Bonds may enforce the lien of the Mortgage without giving the Mortgage Trustees written notice of a default and unless holders of 25% of the First Mortgage Bonds have requested the Mortgage Trustees to act and offered them reasonable opportunity to act and the Mortgage Trustees have failed to act. The Mortgage Trustees are not required to risk their funds or incur personal liability if there is reasonable ground for believing that the repayment is not reasonably assured. Holders of a majority of the First Mortgage Bonds may direct the time, method and place of conducting any proceedings for any remedy available to the Mortgage Trustees, or exercising any trust or power conferred upon the Mortgage Trustees, but the Mortgage Trustees are not required to follow such direction if not sufficiently indemnified for expenditures. (See Mortgage, Sections 67, 71, 80 and 94.) EVIDENCE TO BE FURNISHED TO THE MORTGAGE TRUSTEES Compliance with Mortgage provisions is evidenced by written statements of NW Natural's officers or persons selected by NW Natural. In certain major matters the accountant, engineer, appraiser or other expert must be independent. Various certificates and other papers, including an annual certificate with reference to compliance with the terms of the Mortgage and absence of defaults, are required to be filed annually and upon the occurrence of certain events. (See Mortgage, Sections 38 and 41-46.) 8 MODIFICATION OF THE MORTGAGE The rights of the bondholders may be modified with the consent of holders of 70% of the First Mortgage Bonds and, if less than all series of First Mortgage Bonds are affected, the consent also of holders of 70% of First Mortgage Bonds of each series affected. NW Natural has the right, without any consent or other action by holders of any outstanding series of First Mortgage Bonds, to substitute 66 2/3% for 70%. In general, no modification of the terms of payment of principal and interest, affecting the lien of the Mortgage or reducing the percentage required for modification (except as provided above) will be effective against any bondholder without his consent. (See Mortgage, Article XIX and Ninth Supplemental Indenture, Section 6.) NW Natural has the right to amend the Mortgage, without any consent or other action by holders of any outstanding series of First Mortgage Bonds in the following respects: Release and Substitution of Property To permit the release of property at the lesser of its cost or its fair value at the time that such property became funded property, rather than at its fair value at the time of its release; and to facilitate the release of unfunded property. (See Mortgage, Sections 3, 59 and 60 and Eighteenth Supplemental Indenture, Section 2.03.) Issuance of Additional First Mortgage Bonds To clarify that: (1) for purposes of determining annual interest requirements, interest on First Mortgage Bonds or other indebtedness bearing interest at a variable interest rate shall be computed at the average of the interest rates borne by such First Mortgage Bonds or other indebtedness during the period of calculation or, if such First Mortgage Bonds or other indebtedness shall have been issued after such period or shall be the subject of pending applications, interest shall be computed at the initial rate borne upon issuance, and (2) no extraordinary items shall be included in operating expenses or deducted from revenues or other income in calculating adjusted net earnings (see Mortgage, Section 7); and to revise the basis for the issuance of additional First Mortgage Bonds from 60% of property additions, after adjustments to offset retirements, to 70%. (See Mortgage, Sections 25, 26, 59 and 61 and Eighteenth Supplemental Indenture, Sections 2.01 and 2.02.) THE CORPORATE TRUSTEE Deutsche Bank Trust Company Americas also serves as the Indenture Trustee under the Indenture under which the Indenture Securities, as defined below, are issued. DESCRIPTION OF THE UNSECURED DEBT SECURITIES GENERAL NW Natural will issue its unsecured debt securities, in one or more series, under an Indenture, dated as of June 1, 1991, between NW Natural and Deutsche Bank Trust Company Americas, as trustee (Indenture Trustee). This Indenture, as it may be amended and supplemented from time to time, is referred to in this prospectus as the "Indenture." These unsecured debt securities offered by this prospectus are referred to in this prospectus as the "Unsecured Debt Securities." The Indenture provides for the issuance of debentures, notes or other debt by NW Natural in an unlimited amount from time to time. The Unsecured Debt Securities and all other debentures, notes or other debt of NW Natural issued or 9 to be issued under the Indenture are collectively referred to in this prospectus as the "Indenture Securities." The Indenture does not limit the amount of debt, secured or unsecured, which may be issued by NW Natural. Indenture Securities will rank equally with all other unsecured and unsubordinated indebtedness of NW Natural. Substantially all of the gas plants, distribution systems and certain other materially important physical properties of NW Natural are subject to the lien of the Mortgage securing the First Mortgage Bonds. (See "Description of the Bonds--Security" and "-- Issuance of Additional First Mortgage Bonds", above.) This section briefly summarizes some of the provisions of the Unsecured Debt Securities and some of the provisions of the Indenture and uses some terms that are not defined in this prospectus but that are defined in the Indenture. This summary is not complete. The Indenture is on file with the SEC and is incorporated by reference in this prospectus. You should read the Indenture for a complete understanding of the provisions that may be important to you and for the definitions of some terms used in this summary. Each series of Unsecured Debt Securities may have different terms. NW Natural will include some or all of the following information about a specific series of Unsecured Debt Securities in the prospectus supplement(s) relating to those Unsecured Debt Securities: o the title of those Unsecured Debt Securities, o any limit upon the aggregate principal amount of those Unsecured Debt Securities, o whether those Unsecured Debt Securities will be offered on a periodic basis, with the specific terms of such Unsecured Debt Securities to be determined upon their issuance. o the date(s) on which, and the manner in which, NW Natural will pay the principal of those Unsecured Debt Securities, o the rate(s) of interest on those Unsecured Debt Securities, or how the rate(s) of interest will be determined, the date(s) from which interest will accrue, the dates on which NW Natural will pay interest, the record date for any interest payable on any interest payment date, the manner in which such interest shall be payable, and the basis of computation of interest, o the place(s) at which or methods by which the registered owners of those Unsecured Debt Securities may transfer or exchange those Unsecured Debt Securities and serve notices and demands to or upon NW Natural, o any date(s) on which, the price(s) at which and the terms and conditions upon which those Unsecured Debt Securities may be redeemed, in whole or in part, at the option of NW Natural, o any obligation of NW Natural, and the terms and conditions thereof, to redeem or repurchase those Unsecured Debt Securities, pursuant to any sinking fund or other provisions that would obligate NW Natural to repurchase or redeem those Unsecured Debt Securities, o the denominations in which NW Natural may issue those Unsecured Debt Securities, if other than denominations of $1,000 and any integral multiple of $1,000, o whether the amount of payments of principal of, or premium, if any, or interest on those Unsecured Debt Securities, may be determined with reference to an index, and, if so the manner in which such amounts shall be determined, 10 o the portion of the principal amount of those Unsecured Debt Securities that NW Natural will pay upon declaration of acceleration of the maturity of those Unsecured Debt Securities, if other than the entire principal amount of those Unsecured Debt Securities, o any events of default with respect to those Unsecured Debt Securities and any covenants of NW Natural for the benefit of the registered owners of those Unsecured Debt Securities, other than those specified in this prospectus, o the terms, if any, pursuant to which those Unsecured Debt Securities may be converted into or exchanged for shares of capital stock or other securities of NW Natural or any other entity, o the person to whom NW Natural will pay interest on those Unsecured Debt Securities on any interest payment date, if other than the person in whose name those Unsecured Debt Securities are registered at the close of business on the record date for that interest payment, o the amount and terms of a service charge, if any, for the registration of transfer or exchange of those Unsecured Debt Securities, o any exceptions to the definition of Legal Holiday or variation in the definition of Business Day under the Indenture with respect to those Unsecured Debt Securities, o the terms, if any, required to permit those Unsecured Debt Securities to be registered pursuant to a non-certificated system of registration, and o any other terms of those Unsecured Debt Securities that are not inconsistent with the provisions of the Indenture. FORM, EXCHANGE AND PAYMENT Unless otherwise specified in the prospectus supplement relating to the Unsecured Debt Securities, the Unsecured Debt Securities will be (1) issued in fully registered form in denominations of $1,000 or any amount in excess thereof that is an integral multiple of $1,000 and (2) exchangeable at the office of Deutsche Bank Trust Company Americas in New York City, without charge other than taxes or other governmental charges incident thereto, and principal, premium, if any, and interest will be payable at such office. DEFEASANCE The principal amount of the Unsecured Debt Securities of any series issued under the Indenture will be deemed to have been paid for purposes of the Indenture and the entire indebtedness of NW Natural in respect thereof will be deemed to have been satisfied and discharged, if there shall have been irrevocably deposited with the Indenture Trustee, in trust: (1) money in an amount which will be sufficient, or (2) in the case of a deposit made prior to the maturity of those Unsecured Debt Securities, Government Obligations (as defined below), which do not contain provisions permitting the redemption or other prepayment thereof at the option of the issuer thereof, the principal of and the interest on which when due, without any regard to reinvestment thereof, will provide moneys which, together with the money, if any, deposited with or held by the Indenture Trustee, will be sufficient, or (3) a combination of (1) and (2) which will be sufficient, to pay when due the principal of and premium, if any, and interest, if any, due and to become due on the Unsecured Debt Securities of that series that are outstanding. For this purpose, Government Obligations include direct obligations of, or obligations unconditionally guaranteed by, the United States of America entitled to the benefit of the full faith and credit thereof and certificates, 11 depositary receipts or other instruments which evidence a direct ownership interest in such obligations or in any specific interest or principal payments due in respect thereof. (See Indenture, Sections 101, 701.) If NW Natural deposits any money and/or Government Obligations with respect to the Unsecured Debt Securities of any series, or any portion of the principal amount thereof, prior to the maturity or redemption of such Unsecured Debt Securities or such portion of the principal amount thereof, for the satisfaction or discharge of the indebtedness of NW Natural in respect to such Unsecured Debt Securities or such portion thereof as described in Section 701 of the Indenture, NW Natural shall deliver to the Indenture Trustee either: (1) an instrument wherein NW Natural, notwithstanding such satisfaction and discharge, shall assume the obligation to irrevocably deposit with the Indenture Trustee such additional sums of money, if any, or additional Government Obligations, if any, or any combination thereof, at such time or times, as shall be necessary, together with the money and/or Government Obligations previously deposited, to pay when due the principal of and premium, if any, and interest due and to become due on such Unsecured Debt Securities or such portions thereof, all in accordance with and subject to the provisions of said Section 701; provided, however, that such instrument may state that the obligation of NW Natural to make additional deposits as described above shall be subject to the delivery to NW Natural by the Indenture Trustee of a notice asserting the amount of such deficiency accompanied by an opinion of an independent public accountant of nationally recognized standing, selected by the Indenture Trustee, showing the calculation thereof, or (2) an opinion of counsel to the effect that the holders of such Unsecured Debt Securities, or such portions of the principal amount thereof, will not recognize income, gain or loss for United States federal income tax purposes as a result of such satisfaction and discharge and will be subject to United States federal income tax on the same amounts, at the same times and in the same manner as if such satisfaction and discharge had not been effected. In the event that NW Natural shall elect to deliver to the Indenture Trustee an instrument as described in clause (1) of the preceding paragraph in connection with any such deposit of money and/or Government Obligations with the Indenture Trustee, under current applicable United States federal income tax regulations, the holders of such Indenture Securities, or such portions thereof, will not recognize income, gain or loss for United States federal income tax purposes as a result of such satisfaction and discharge and will be subject to United States federal income tax on the same amounts, at the same times and in the same manner as if such deposit had not been effected. There can be no assurance that such United States federal income tax regulations will not change such that, as a result of such deposit and delivery by NW Natural of such instrument, holders of Unsecured Debt Securities may recognize income, gain or loss for United States federal income tax purposes and may not be subject to United States federal income tax on the same amounts, at the same times and in the same manner as if such deposit had not been made. EVENTS OF DEFAULT AND NOTICE THEREOF Events of default are: (1) default for three business days in payment of principal, (2) default for 60 days in payment of interest, (3) certain events in bankruptcy, insolvency or reorganization, (4) default for 90 days after notice in the case of a breach of any other covenant, and (5) any other event of default specified with respect to the Indenture Securities of a particular series. 12 No event of default with respect to a series of Indenture Securities necessarily constitutes an event of default with respect to the Indenture Securities of any other series. The Indenture Trustee may withhold notice of default (except in payment of principal, interest or any funds for the retirement of Indenture Securities) if it, in good faith, determines that withholding of such notice is in the interest of the holders of the Indenture Securities. (See Indenture, Sections 801 and 903.) Either the Indenture Trustee or the holders of not less than 33% in principal amount (or such lesser amount as may be provided in the case of discount Indenture Securities) of the outstanding Indenture Securities of all defaulted series, considered as one class, may declare the principal and interest on such series due on default, but NW Natural may annul such default by effecting its cure and paying overdue interest and principal. No holder of Indenture Securities may enforce the Indenture without having given the Indenture Trustee written notice of default, and unless the holders of a majority of the Indenture Securities of all defaulted series, considered as one class, shall have requested the Indenture Trustee to act and offered reasonable indemnity, and for 60 days the Indenture Trustee shall have failed to act. But, each holder has an absolute right to receive payment of principal and interest when due and to institute suit for the enforcement of such payment. The Indenture Trustee is not required to risk its funds or incur any financial liability if it has reasonable grounds to believe that repayment is not reasonably assured. The holders of a majority of the Indenture Securities of all defaulted series, considered as one class, may direct the time, method and place of conducting any proceedings for any remedy available to the Indenture Trustee, or exercising any trust or power conferred on the Indenture Trustee, with respect to the Indenture Securities of such series, but the Indenture Trustee is not required to follow such direction if not sufficiently indemnified and the Indenture Trustee may take any other action it deems proper which is not inconsistent with such direction. (See Indenture, Sections 802, 807, 808, 812 and 902.) EVIDENCE TO BE FURNISHED TO THE INDENTURE TRUSTEE Compliance with Indenture provisions will be evidenced by written statements of NW Natural's officers. An annual certificate with reference to compliance with the covenants and conditions of the Indenture and the absence of defaults is required to be filed with the Indenture Trustee. (See Indenture, Section 1004.) MODIFICATION OF THE INDENTURE The rights of the holders of the Indenture Securities may be modified with the consent of the holders of a majority of the Indenture Securities of all series or Tranches, as defined below, affected, considered as one class. However, certain specified rights of the holders of Indenture Securities may be modified without the consent of the holders if such modification would not be deemed to adversely affect their interests in any material respect. In general, no modification of the terms of payment of principal and interest, no reduction of the percentage in principal amount of the Indenture Securities outstanding under such series required to consent to any supplemental indenture or waiver under the Indenture, no reduction of such percentage necessary for quorum and voting, and no modification of certain of the provisions in the Indenture relating to supplemental indentures, waivers of certain covenants and waivers of past defaults is effective against any holder of Indenture Securities without the consent of such holder. "Tranche" means a group of Indenture Securities which are of the same series and have identical terms except as to principal amount and/or date of issuance. (See Indenture, Article Twelve.) THE INDENTURE TRUSTEE Deutsche Bank Trust Company Americas also serves as the Corporate Trustee under the Mortgage under which the First Mortgage Bonds are issued. DESCRIPTION OF PREFERREDCOMMON STOCK

General

The following is a summary of certain rights and privileges of NW Natural's preferred stock.Natural’s common stock and the associated common share purchase rights. This summary description does not purport to be complete. Reference is made to NW Natural'sNatural’s Restated Articles of Incorporation, 13 its Bylaws and any articlesthe Rights Agreement, dated as of amendment to the Restated Articles of Incorporation establishing a particular series of preferred stock,February 27, 1996, as amended (Rights Agreement), between NW Natural and American Stock Transfer & Trust Company, which are filed as exhibits to this registration statement, or in the case of any articles of amendment relating to a future series of preferred stock, will be filed with the SEC prior to the issuance of such series, and incorporated herein by reference. The following statements are qualified in their entirety by such references.

Under NW Natural’s Restated Articles of Incorporation, NW Natural is authorized to issue 60,000,000 shares of common stock, 1,500,000 shares of preferred stock, without par value, and 2,000,000 shares of preference stock, without par value. At March 25, 2005, 27,592,496 shares of common stock were outstanding and no shares of either the preferred stock or the preference stock were outstanding.

The Board of Directors is authorized under NW Natural'sNatural’s Restated Articles of Incorporation to provide for the issuance from time to time of preferred stock or preference stock in one or more series, and as to each series to fix and determine the relative rights and preferences, serial designation, dividend rate, redemption prices, voluntary and involuntary liquidation prices, sinking fund provisions for the redemption or purchase of shares, if any, and conversion provisions, if any, applicable to shares of such series. NW Natural will include some or all of this information about a specific series of preferred stock being offered in the prospectus supplement(s) relating to such series. As used herein, the term "preferred stock" includes all series. DIVIDENDS Each series of the preferred stock is entitled in preference to the common stock and the preference stock (a separate class of capital stock subordinate to the preferred stock, see Restated Articles of Incorporation, Article III, C. 10) to dividends cumulative from the date of issue, at the rate fixed by the Board of Directors, payable quarterly on February 15, May 15, August 15 and November 15. VOTING RIGHTS Generally, only NW Natural's common stock has voting rights. The common stock has cumulative voting rights with respect to the election of directors. The preferred stock has the special right to elect the smallest number of directors which shall constitute at least one-fourth of the total number of directors, or two directors, whichever shall be greater, if payments of four full quarterly dividends or more per share on any share or shares of preferred stock are in arrears. OTHER PROVISIONS NW Natural may not, without the written consent or affirmative vote of the holders of two-thirds of the preferred stock then outstanding (1) create or authorize any new stock ranking prior to the preferred stock as to dividends or upon dissolution, liquidation or winding up, or (2) amend, alter or repeal any of the express terms of the preferred stock then outstanding in a manner substantially prejudicial to the holders thereof, except, that, if any such proposed amendment, alteration or repeal would be substantially prejudicial to less than all series of preferred stock, then only the consent of the holders of two-thirds of the total number of shares of all series so affected is required. In addition, NW Natural may not, without the written consent or affirmative vote of the holders of a majority of the preferred stock then outstanding, issue preferred stock or any other class of stock ranking prior to or on a parity with the preferred stock as to dividends or upon dissolution, liquidation or winding up unless (1) the net income of NW Natural available for the payment of dividends for a period of twelve consecutive months within the fifteen preceding months is at least equal to two times the annual dividend requirements of the preferred stock, and all other classes of stock ranking prior to or on a parity with the preferred stock, to be outstanding immediately after the issuance of such stock, including the stock proposed to be issued, and the gross income of NW Natural available for the payment of interest for a period of twelve consecutive months within the fifteen preceding months is at least equal to one and one-half times the aggregate of the annual interest requirements on its indebtedness, and the annual dividend requirements of the preferred stock and of all other classes of stock ranking prior to or on a parity with the preferred stock as to dividends or upon dissolution, liquidation or winding up, to be outstanding immediately after the issuance of such stock, including the stock proposed to be issued and (2) the capital of NW Natural applicable to the common stock and its surplus is not less than the amount payable on the involuntary dissolution, liquidation or winding up of the corporation on the preferred stock, and on all other classes of stock ranking prior to or on a parity with the preferred stock as to the dividends or upon dissolution, liquidation or winding up, to be outstanding immediately after the issuance of such shares, including the shares proposed to be issued. 14 Certain terms relating to NW Natural's preferred stock and preference stock in respect of dividends, liquidation rights, limitations on payment of dividends and voting are discussed below in "Description of Common Stock--

Dividends and Liquidation Rights" and "-- Dividend Limitations". DESCRIPTION OF COMMON STOCK GENERAL The following is a summary of certain rights and privileges of NW Natural's common stock and the associated common share purchase rights. This summary description does not purport to be complete. Reference is made to NW Natural's Restated Articles of Incorporation and its Bylaws and the Rights Agreement, dated as of February 27, 1996, as amended (Rights Agreement), between NW Natural and ChaseMellon Shareholder Services which are filed as exhibits to this registration statement, and incorporated herein by reference. The following statements are qualified in their entirety by such references. DIVIDENDS AND LIQUIDATION RIGHTS

Except as hereinafter stated, the common stock is entitled to receive such dividends as are declared by the Board of Directors and to receive ratably on liquidation any assets which remain after payment of liabilities. NW Natural has two authorized classes of senior capital stock. They are preferred stock and preference stock, none of which is currently outstanding. NW Natural'sNatural’s preferred stock and preference stock are entitled in preference to the common stock (1) to cumulative dividends at the annual rate fixed for each series by the Board of Directors, and (2) in voluntary and involuntary liquidation, to the amounts fixed for each series by the Board of Directors, plus in each case, unpaid accumulated dividends. DIVIDEND LIMITATIONS

Dividend Limitations

Should dividends on either the preferred stock or the preference stock be in arrears, no dividends on the common stock may be paid or declared. Except with the consent of the holders of a majority of the preferred stock then outstanding, no dividends on the common stock or the preference stock may be paid or declared unless the preferred stock purchase and sinking fund obligations have been met for that year. Future series of the preferred stock or the preference stock could contain sinking fund, purchase or redemption obligations under which no dividends on the common stock may be paid or declared while such obligations are in default. Common stock dividends also may be restricted by the provisions of future instruments pursuant to which NW Natural may issue long-term debt. VOTING RIGHTS

Voting Rights

Except as provided by law or as described below, only the common stock has voting rights. Cumulative voting is permitted by the Restated Articles of Incorporation to holders of common stock at elections of directors. The preferred stock has the special right to elect the smallest number of directors which constitutes at least one-fourth of the total number of directors, or two directors, whichever is greater, if payments of four quarterly dividends or more on any share or shares of preferred stock should be in arrears. CLASSIFICATION OF THE BOARD OF DIRECTORS

Classification of the Board of Directors

The Board of Directors of NW Natural may consist of not less than 9 nor more than 13 persons, as determined by the Board, divided into three classes as nearly equal in number as possible. The current number is

11. One class is elected for a three-year term at each annual meeting of shareholders. Vacancies, including those resulting from an increase in the size of the Board, may be filled by a majority vote of the directors then in office, to serve until the next annual meeting of shareholders. One or more of the directors may be removed, with or without cause, by the affirmative vote of the holders of not less than two-thirds of the shares entitled to vote thereon; provided, however, that if fewer than all of the directors should be candidates for removal, no one of them shall be removed if the votes cast against such director'sdirector’s removal would be sufficient to elect such director if then cumulatively voted at an election 15 of the class of directors of which such director shall be a part. Except for those persons nominated by the Board, no person shall be eligible for election as a director unless a request from a shareholder entitled to vote in the election of directors that such person be nominated and such person'sperson’s consent thereto shall be delivered to the Secretary of NW Natural within the time period specified in advance of the meeting at which such election shall be held. The foregoing provisions may not be amended or repealed except by the affirmative vote of the holders of not less than two-thirds of the shares entitled to vote at an election of directors. The foregoing provisions will not apply to directors, if any, elected by the holders of the preferred stock. TRANSACTIONS WITH RELATED PERSONS

Transactions with Related Persons

NW Natural shall not enter into any business transaction with a related person or in which a related person shall have an interest (except proportionately as a shareholder of NW Natural) without first obtaining both (1) the affirmative vote of the holders of not less than two-thirds of the outstanding shares of the capital stock of NW Natural not held by such related person, and (2) the determination of a majority of the continuing directors that the cash or fair market value of the property, securities or other consideration to be received per share by the holders, other than such related person, of the shares of each class or series of the capital stock of NW Natural in such business transaction shall not be less than the highest purchase price paid by such related person in acquiring any of its holdings of shares of the same class or series, unless the continuing directors by a majority vote shall either (a) have expressly approved the acquisition of the shares of the capital stock of NW Natural that caused such related person to become a related person, or (b) have expressly approved such business transaction. As used in this paragraph: a "business transaction"“business transaction” includes a merger, consolidation, reorganization or recapitalization, a purchase, sale, lease, exchange or mortgage of all or a substantial part (10% or more) of the property of NW Natural or a related person, an issuance, sale or exchange of securities and a liquidation, spin-off or dissolution; a "related person"“related person” includes a person, organization or group thereof owning 10% or more of the capital stock of NW Natural; "continuing directors"“continuing directors” are those whose nominations for directorship shall have been approved by a majority of the directors in office on April 9, 1984 or by a majority of the then continuing directors. The foregoing provisions may not be amended or repealed except by the affirmative vote of the holders of not less than two-thirds of the shares of the capital stock of NW Natural (other than shares held by related persons). PREEMPTIVE RIGHTS

Preemptive Rights

The holders of the common stock have no preemptive rights. OTHER PROVISIONS

Other Provisions

The issued and outstanding shares of NW Natural'sNatural’s common stock are, and the common stock offered hereby will be, fully paid and nonassessable. COMMON SHARE PURCHASE RIGHTS The

Common Share Purchase Rights

Under the Company’s Rights Agreement, the holders of the common stock have one common share purchase right for each of their shares. Each right, initially evidenced by and traded with the common stock, entitles the holder to purchase one-tenth of a share of common stock at a purchase price of $6.67, subject to adjustment (Purchase Price). The rights will be exercisable only if a person or group (Person) shall acquire

ownership of 15% or more of the common stock (such Person being hereinafter referred to as an Acquiring Person) or shall announce a tender offer, the consummation of which would result in such Person becoming an Acquiring Person.

If any Person shall have become an Acquiring Person, each right, other than rights owned by the Acquiring Person (which shall be void), may be exercised by its holder to purchase, at a 50% discount, shares of common stock having a market value equal to 20 times the Purchase Price. If a Person shall have become an Acquiring Person but shall not have acquired ownership of 50% or more of the common stock, the Board of Directors may provide for the exchange of all or a part of the rights (other than rights which shall be void as described above) for common stock at a ratio of one share per right.

In the event that (i) NW Natural shall consolidate or merge with any other Person, (ii) any Person shall consolidate or merge with NW Natural and NW Natural shall be the surviving corporation and, in connection therewith, all or 16 part of the common stock shall be changed into or exchanged for stock or other securities of any Person (including NW Natural) or cash or any other property, or (iii) NW Natural shall sell or otherwise transfer, assets or earning power aggregating 50% or more of the assets or earning power of NW Natural to any other Person, each right, except rights owned by an Acquiring Person (which shall be void), may be exercised by its holder to purchase, at a 50% discount, shares of common stock of the other Person having a market value equal to 20 times the Purchase Price.

At any time prior to any Person becoming an Acquiring Person, the Board of Directors may redeem the rights at a price of $.01 per right. The rights will expire on March 15, 2006 unless they are exchanged or redeemed (as described above) earlier than that date.

The issuance of common stock upon exercise of the rights will be subject to any necessary regulatory approvals.

The rights have anti-takeover effects because they will cause substantial dilution of the common stock if a Person attempts to acquire NW Natural on terms not approved by the Board of Directors. PLAN OF DISTRIBUTION

Certain Anti-Takeover Matters

NW Natural’s Restated Articles of Incorporation and Bylaws include a number of provisions that may have the effect of discouraging persons from acquiring large blocks of its stock or delaying or preventing a change in its control. The material provisions that may have such an effect include:

establishment of a classified Board of Directors, whereby only one-third of the board stands for election each year; and

limitations on certain business transactions (including mergers, consolidations, plans of exchange) with any person or entity and any persons or entities related thereto who beneficially own 10 percent or more of the capital stock of the NW Natural.

authorization for NW Natural’s Board of Directors (subject to any applicable law) to issue preferred or preference stock in series and to fix the rights and preferences of the series;

advance notice procedures with respect to nominations of directors or proposals other than those adopted or recommended by NW Natural’s Board of Directors;

a requirement that holders of not less than two-thirds of the shares entitled to vote are required to remove directors or to amend certain provisions of NW Natural’s Restated Articles of Incorporation; and

a requirement that the Bylaws may only be amended or repealed by resolution of a majority of the Board of Directors, subject to repeal or change by action of the shareholders.

The rights have anti-takeover effects because they will cause substantial dilution of the common stock if an acquisition of NW Natural may sellis attempted on terms not approved by the securities offered pursuantBoard of Directors.

NW Natural is subject to this prospectus and onethe provisions of sections 60.825 to 60.845 of the Oregon Business Corporation Act (OBCA) which generally provide that in the event a person or entity acquires 15% or more prospectus supplements (Offered Securities)of NW Natural’s voting stock (“interested stockholder”), NW Natural and such interested stockholder and any affiliate may not engage in onethe following business combinations for a period of three years following the date that person became an interested stockholder:

a merger or plan of share exchange;

any sale, lease, mortgage or other disposition of the assets of the corporation where the assets have an aggregate market value equal to 10% or more series in any of three ways: (1) through underwritersthe aggregate market value of NW Natural’s assets or dealers; (2) through agents; or (3) directly to a limited number of purchasers or to a single purchaser. THROUGH UNDERWRITERS OR DEALERS If underwriters are usedoutstanding capital stock; and

transactions that result in the sale,issuance of capital stock to the Offered Securities will bestockholder that acquired 15% or more of the voting stock.

These restrictions do not apply if:

the Board of Directors approved the share acquisition or business combination that resulted in the person becoming an interested stockholder before the time such person became an interested stockholder;

as a result of the share acquisition, the person became an interested stockholder and 85% owner of the voting stock, excluding shares owned by persons who are directors and also officers and shares owned by certain employee benefit plans; or

the business combination transaction is approved by the underwriters for their own accountBoard of Directors and mayauthorized by the affirmative vote of at least two-thirds of the outstanding voting stock not owned by the interested stockholder.

NW Natural is also subject to the provisions of 60.801 to 60.816 of the Oregon Control Share Act (OCSA), which generally provide that a person who acquires voting stock in a transaction which results in such person holding more than 20%, 33 1/3% or 50% of the total voting power cannot vote the shares it acquires in the acquisition unless voting rights are accorded to such control shares by the holders of a majority of the outstanding voting shares, excluding the control shares held by such person and shares held by officers and inside directors, and by the holders of a majority of the outstanding voting shares, including shares held by officers and inside directors. This vote would be resold from time to time in one or more transactions, including negotiated transactions, at the initial public offering price or at varying prices determinedrequired at the time an acquiring person’s holdings exceed 20% of the sale.total voting power, and again at the time the acquiring person’s holdings exceed 33 1/3% and 50%, respectively. The Offered Securitiesacquiring person may, be offeredbut is not required to, submit an “acquiring person statement” setting forth certain information about the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more managing underwriters. The underwriter or underwritersacquiring person and its plans with respect to NW Natural. The acquiring person statement may also request that NW Natural call a special meeting of stockholders to determine whether the Offered Securitiescontrol shares will be named inallowed to retain voting rights. If the prospectus supplement relating to such offering and, if an underwriting syndicate is used,acquiring person does not request a special meeting of stockholders, the managing underwriter or underwritersissue of voting rights of control shares will be set forth onconsidered at the cover pagenext annual meeting or special meeting of such prospectus supplement. Unless otherwise set forth in such prospectus supplement,stockholders that is held more than 60 days after the obligationsdate of the underwritersacquisition of control shares. Shares are not deemed to purchasebe acquired in a control share acquisition if, among other things, they are acquired from the Offered Securities offered by such prospectus supplement will be subjectissuing corporation, or are issued pursuant to certain conditions precedent,a plan of merger or exchange effected in compliance with the OBCA and the underwritersissuing corporation is a party to the merger or exchange agreement.

The OCSA and the OBCA have anti-takeover effects because they will be obligatedencourage any potential acquirer to purchase allnegotiate with NW Natural’s Board of such Offered Securities if any are purchased. THROUGH AGENTS The Offered SecuritiesDirectors and will also discourage potential acquirers unwilling to comply with the provisions of these laws. An Oregon corporation may be sold through agents designated byprovide in its articles of incorporation or bylaws that the laws described above do not apply to its shares. NW Natural from time to time. A prospectus supplement will set forth the name of any agent involved in the offer or salehas not adopted such a provision.

EXPERTS

The financial statements and management’s assessment of the Offered Securitieseffectiveness of internal control over financial reporting (which is included in respect of which such prospectus supplement is delivered as well as any commissions payable by NW Natural to such agent. Unless otherwise indicated in such prospectus supplement, any such agent will be actingManagement’s Report on a reasonable best efforts basis for the period of its appointment. DIRECTLY TO ONE OR MORE PURCHASERS NW Natural may sell the Offered Securities directly to one or more purchasers. In this case, no underwriters or agents would be involved. GENERAL INFORMATION The prospectus supplement with respect to the Offered Securities will set forth the terms of the offering of such Offered Securities, including: 17 o the name or names of any underwriters, dealers or agents; o the purchase price of such Offered Securities and the proceeds to NW Natural from such sale; o any underwriting discounts, agents' commissions and other items constituting underwriting compensation; o any initial public offering price; and o any discounts or concessions allowed or reallowed or paid to dealers. Any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time. If so indicated in the prospectus supplement with respect to the Offered Securities, NW Natural may authorize agents, underwriters or dealers to solicit offers by certain specified institutions to purchase the Offered Securities from NW Natural at the initial public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. Such contracts will be subject to those conditions set forth in such prospectus supplement, and such prospectus supplement will set forth the commission payable for solicitation of such contracts. Agents, underwriters and dealers may be entitled under agreements entered into with NW Natural to indemnification by NW Natural against certain civil liabilities, including certain liabilities under the Securities Act or to contribution by NW Natural with respect to payments which such agents, underwriters and dealers may be required to make in respect thereof. EXPERTS The financial statementsInternal Control over Financial Reporting) incorporated in this Prospectus by reference to NW Natural'sthe Annual Report on Form 10-K for the year ended December 31, 20022004 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent accountants,registered public accounting firm, given on the authority of said firm as experts in auditing and accounting. LEGALITY

The legalitystatements made as to matters of law and legal conclusions under “Tax Consequences of Participation in the securities will be passed upon for NW Natural by Beth A. Ugoretz, Esquire, General Counsel of NW Natural, andPlan” herein have been reviewed by Thelen Reid & Priest LLP, New York, New York, and for the underwriters, dealers, or agents by Simpson Thacher & Bartlett LLP, New York, New York. Ms. Ugoretz may relyThese statements are set forth in reliance upon the opinion of Thelen Reid & Priest LLP given upon their authority as to certain legal matters arising under New York law. Thelen Reid & Priest LLP and Simpson Thacher & Bartlett LLP may rely upon the opinion of Ms. Ugoretz as to certain legal matters arising under Oregon law, and Ms. Ugoretz, Thelen Reid & Priest LLP and Simpson Thacher & Bartlett LLP may rely upon the opinion of Stoel Rives LLP, Portland, Oregon, as to certain legal matters arising under Washington law. However, all matters pertaining to titles, the lien and enforceability of the Mortgage and franchises, will be passed upon only by Ms. Ugoretz, who may rely on the opinion of Stoel Rives LLP as to certain legal matters arising under Washington law. 18 experts.

PART II

INFORMATION NOT REQUIRED IN PROSPECTUS ITEM

Item 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION (ESTIMATED, EXCEPT SEC FILING FEE). Filing Fee-SecuritiesOther Expenses of Issuance and Exchange Commission................................... $19,820 FeesDistribution.

The following table sets forth the expenses (estimated except for registration fee) in connection with the offering described in this Registration Statement:

Filing Fee-Securities and Exchange Commission

  $3,152

New York Stock Exchange listing fee

   14,750

Legal and Blue Sky filing fees

   2,000

Accounting fees and expenses

   10,000

Printing and engraving

   20,000

Miscellaneous expense

   10,000
   

Total

  $59,902
   

Item 15. Indemnification of Trustees, including counselDirectors and authentication fees...................... $20,000 Legal fees ..................................... $175,000 Accounting fees and expenses ................... $50,000 Rating Agencies' fees .......................... $105,000 Printing and engraving ......................... $25,000 Miscellaneous expense .......................... $10,180 -------- Total expenses ............................... $405,000 ======== ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS. Officers

The Oregon Business Corporation Act (the "Act"“Act”) provides, in general, that a director or officer of a corporation who has been or is threatened to be made a defendant in a legal proceeding because that person is or was a director or officer of the corporation:

(1) shall be indemnified by the corporation for all expenses of such litigation when the director or officer is wholly successful on the merits or otherwise;

(2) may be indemnified by the corporation for the expenses, judgments, fines and amounts paid in settlement of such litigation (other than a derivative lawsuit) if he or she acted in good faith and in a manner reasonably believed to be in, or at least not opposed to, the best interests of the corporation (and, in the case of a criminal proceeding, had no reasonable cause to believe the conduct was unlawful); and

(3) may be indemnified by the corporation for expenses of a derivative lawsuit (a suit by a shareholder alleging a breach by a director or officer of a duty owed to the corporation) if he or she acted in good faith and in a manner reasonably believed to be in, or at least not opposed to, the best interests of the corporation, provided the director or officer is not adjudged liable to the corporation.

The Act also authorizes the advancement of litigation expenses to a director or officer upon receipt of a written affirmation of the director'sdirector’s or officer'sofficer’s good faith belief that the standard of conduct in Section (2) or (3) above has been met and an undertaking by such director or officer to repay such expenses if it is ultimately determined that he or she did not meet that standard and, therefore, is not entitled to be indemnified. The Act also provides that the indemnification provided thereunder shall not be deemed exclusive of any other rights to which those indemnified may be entitled under any bylaw, agreement, vote of shareholders or disinterested directors or otherwise.

NW Natural'sNatural’s Bylaws provide that NW Natural shall indemnify directors and officers to the fullest extent permitted under the Act, thus making mandatory the discretionary indemnification authorized by the Act.

NW Natural'sNatural’s Restated Articles of Incorporation provide that NW Natural shall indemnify its officers and directors to the fullest extent permitted by law, which may be broader than the indemnification authorized by the Act. II-1

NW Natural'sNatural’s shareholders have approved and NW Natural has entered into indemnity agreements with its directors and officers which provide for indemnity to the fullest extent permitted by law and also alter or clarify the statutory indemnity in the following respects:

(1) prompt advancement of litigation expenses is provided if the director or officer makes the required affirmation and undertaking;

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(2) the director or officer is permitted to enforce the indemnity obligation in court and the burden is on NW Natural to prove that the director or officer is not entitled to indemnification;

(3) indemnity is explicitly provided for judgments and settlements in derivative actions;

(4) prompt indemnification is provided unless a determination is made that the director or officer is not entitled to indemnification; and

(5) partial indemnification is permitted if the director or officer is not entitled to full indemnification.

NW Natural maintains in effect a policy of insurance providing for reimbursement to NW Natural of payments made to directors and officers as indemnity for damages, judgments, settlements, costs and expenses incurred by them which NW Natural may be required or permitted to make according to applicable law, common or statutory, or under provisions of its Restated Articles of Incorporation, Bylaws or agreements effective under such laws. ITEM

Item 16. LIST OF EXHIBITS. List of Exhibits

Reference is made to the Exhibit Index on page II-6 hereof. ITEM

Item 17. UNDERTAKINGS. Undertakings.

(a) The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933 (the Securities Act);

(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high andend of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the "Calculation“Calculation of Registration Fee"Fee” table in the effective Registration Statement; and

(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided,

Provided,however, that paragraphs (a)(1)(i) and (ii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the registrant pursuant to Sections 13 or 15(d) of the Securities Exchange Act of 1934 (the Exchange Act) that are incorporated by reference in the registration statement; II-2 statement.

(2) That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof;

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering; and

(4) That, for purposes of determining any liability under the Securities Act, each filing of the registrant'sregistrant’s annual report pursuant to Sections 13(a) or 15(d) of the Exchange Act that is incorporated by

II-2


reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered herein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(b) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the provisions described under Item 15 above, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. (j) The undersigned registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of section 310 of the Trust Indenture Act of 1939 (Trust Indenture Act) in accordance with the rules and regulations prescribed by the Commission under section 305(b)(2) of the Trust Indenture Act.

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POWER OF ATTORNEY

Each director and/or officer of the registrant whose signature appears hereinafter hereby appoints Mark S. Dodson, Bruce R. DeBolt, Beth A. UgoretzDavid H. Anderson and John T. Hood, the Agents for Service named in this registration statement, and each of them severally, as his or her attorney-in-fact to sign in his or her name and behalf, in any and all capacities stated below, and to file with the Securities and Exchange Commission, any and all amendments, including post-effective amendments, to this registration statement, and the registrant hereby also appoints each such Agent for Service as its attorney-in-fact with like authority to sign and file any such amendments in its name and behalf.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Portland, and State of Oregon on the 6th day of February, 2004. NORTHWEST NATURAL GAS COMPANY By: /s/ Mark S. Dodson ------------------------------------ Mark S. Dodson President and Chief Executive Officer April, 2005.

NORTHWEST NATURAL GAS COMPANY

By:

/s/    MARK S. DODSON        


Mark S. Dodson

President and Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Title Date --------- ----- ---- /s/ Mark S. Dodson Principal Executive February 6, 2004 - ------------------------ Officer, and Director Mark S. Dodson, President and Chief Executive Officer /s/ Bruce R. DeBolt Principal Financial February 6, 2004 - ------------------------ Officer Bruce R. DeBolt Senior Vice President, Finance, and Chief Financial Officer /s/ Stephen P. Feltz Principal Accounting February 6, 2004 - ------------------------ Officer Stephen P. Feltz, Treasurer and Controller /s/ Timothy P. Boyle Director ) February 6, 2004 - ------------------------ ) Timothy P. Boyle ) /s/ John D. Carter Director ) February 6, 2004 - ------------------------ ) John D. Carter ) /s/ C. Scott Gibson Director ) February 6, 2004 - ------------------------ ) C. Scott Gibson ) /s/ Tod R. Hamachek Director ) February 6, 2004 - ------------------------ ) Tod R. Hamachek ) /s/ Randall C. Pape Director ) February 6, 2004 - ------------------------ ) Randall C. Pape )

Signature


Title


Date


/s/    MARK S. DODSON        


Mark S. Dodson

President and Chief Executive Officer

Principal Executive Officer, and Director

April 6, 2005

/s/    DAVID H. ANDERSON        


David H. Anderson

Senior Vice President and Chief Financial Officer

Principal Financial Officer

April 6, 2005

/s/    STEPHEN P. FELTZ        


Stephen P. Feltz

Treasurer and Controller

Principal Accounting Officer

April 6, 2005

/s/    TIMOTHY P. BOYLE        


Timothy P. Boyle

Director

April 6, 2005

/s/    MARTHA BYORUM        


Martha Byorum

Director

April 6, 2005

/s/    JOHN D. CARTER        


John D. Carter

Director

April 6, 2005

/s/    C. SCOTT GIBSON        


C. Scott Gibson

Director

April 6, 2005

II-4 /s/ Richard G. Reiten Director ) February 6, 2004 - ------------------------------ ) Richard G. Reiten ) /s/ Robert L. Ridgley Director ) February 6, 2004 - ------------------------------ ) Robert L. Ridgley ) /s/ Melody C. Teppola Director ) February 6, 2004 - ------------------------------ ) Melody C. Teppola ) /s/ Russell F. Tromley Director ) February 6, 2004 - ------------------------------ ) Russell F. Tromley ) /s/ Richard L. Woolworth Director ) February 6, 2004 - ------------------------------ ) Richard L. Woolworth )


Signature


Title


Date


/s/    TOD R. HAMACHEK        


Tod R. Hamachek

Director

April 6, 2005

/s/    RANDALL C. PAPÉ        


Randall C. Papé

Director

April 6, 2005

/s/    RICHARD G. REITEN        


Richard G. Reiten

Director

April 6, 2005

/s/    RUSSELL F. TROMLEY        


Russell F. Tromley

Director

April 6, 2005

/s/    RICHARD L. WOOLWORTH        


Richard L. Woolworth

Director

April 6, 2005

Kenneth Thrasher

Director

II-5


INDEX TO EXHIBITS EXHIBIT NO. DESCRIPTION - -------- ---------------------------------------------------------------------- +1(a) Form of Underwriting Agreement relating to the debt securities. +1(b) Form of Underwriting Agreement relating to the common stock. +1(c) Form of Underwriting Agreement relating to the preferred stock. *4(a) Restated Articles of Incorporation, as filed and effective June 24, 1988, as amended December 8, 1992, December 1, 1993 and May 27, 1994 (filed as Exhibit 3a. to Form 10-K for 1994). 4(b) Bylaws as amended December 18, 2003. *4(c) Rights Agreement, dated as of February 27, 1996, between the Company and Boatmen's Trust Company, ChaseMellon Shareholder Services as successor, which includes as Exhibit A thereto the form of a Right Certificate and as Exhibit B thereto the Summary of Rights to Purchase Common Shares (filed as Exhibit 1 to Form 8-A, dated February 27, 1996), as amended by Amendment No. 1 thereto, dated October 5, 2001 (filed as Exhibit 4h. to Form 10-K for 2002). +4(d) Form of Articles of Amendment to Restated Articles of Incorporation establishing a series of Preferred Stock. *4(e) Copy of Mortgage and Deed of Trust, dated as of July 1, 1946, to Bankers Trust Company (now Deutsche Bank Trust Company Americas) and R.G. Page (to whom Stanley Burg is now successor), Trustees (filed as Exhibit 7(j) in File No. 2-6494), together with Indentures supplemental thereto Nos. 1 through 14, dated, respectively, as of June 1, 1949, March 1, 1954, April 1, 1956, February 1, 1959, July 1, 1961, January 1, 1964, March 1, 1966, December 1, 1969, April 1, 1971, January 1, 1975, December 1, 1975, July 1, 1981, June 1, 1985, and November 1, 1985 (filed as Exhibit 4(d) in File No. 33-1929); No. 15, dated as of July 1, 1986 (filed as Exhibit (4)(c) in File No. 33-24168); Nos. 16, 17 and 18, dated, respectively, as of November 1, 1988, October 1, 1989 and July 1, 1990 (filed as Exhibit (4)(c) in File No. 33-40482); No. 19, dated as of June 1, 1991 (filed as Exhibit 4(c) in File No. 33-64014; and No. 20, dated as of June 1, 1993 (filed as Exhibit 4(c) in File No. 33-53795). 4(f) Form of Supplemental Indenture relating to First Mortgage Bonds. 4(g) Form of First Mortgage Bond. *4(h) Copy of Indenture, dated as of June 1, 1991, to Bankers Trust Company (now Deutsche Bank Trust Company Americas), Trustee, relating to the Unsecured Debt Securities (filed as Exhibit 4(e) in File No. 33-64014). *4(i) Copy of Officers' Certificate, dated as of June 18, 1993, establishing series of unsecured medium term notes and Form of Instructions for both secured and unsecured medium term notes (filed as Exhibit 4(f) to Form 10-K for the year ended December 31, 1993). 4(j) Form of Officers' Certificate, together with form of fixed rate unsecured note, establishing the issuance of one or more series of Unsecured Debt Securities (including the form of Unsecured Debt Security). 5(a) Opinion of Beth A. Ugoretz, Esquire, regarding the validity of the securities. 5(b) Opinion of Thelen Reid & Priest LLP, regarding the validity of the securities. 12 Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined Fixed Charges and Preference Dividends. 23(a)

Exhibit

*4(a)Restated Articles of Incorporation, as filed and effective June 24, 1988, as amended December 8, 1992, December 1, 1993 and May 27, 1994 (filed as Exhibit 3a. to Form 10-K for 1994).
*4(b)Bylaws as amended July 22, 2004 (filed as Exhibit 3 to Form 10-Q for quarter ended June 30, 2004).
*4(c)Rights Agreement, dated as of February 27, 1996, between NW Natural and Boatmen’s Trust Company (American Stock Trust & Transfer Company, successor), which includes as Exhibit A thereto the form of a Right Certificate and as Exhibit B thereto the Summary of Rights to Purchase Common Shares (filed as Exhibit 1 to Form 8-A, dated February 27, 1996), as amended by Amendment No. 1 thereto, dated October 5, 2001 (filed as Exhibit 4h. to Form 10-K for 2002).
5(a)Opinion of C.J. Rue.
5(b) and 8Opinion of Thelen Reid & Priest LLP.
23Consent of PricewaterhouseCoopers LLP. 23(b) Consent of Stoel Rives LLP. Consents of C.J. Rue and Thelen Reid & Priest LLP are included in their opinions filed, respectively, as Exhibits 5(a) and 5(b).
24Power of Attorney (see page II-4).

*Previously filed

II-6 23(c) The consents of Beth A. Ugoretz, Esquire, and of Thelen Reid & Priest LLP are included in their opinions filed, respectively, as Exhibits 5(a) and 5(b). 24 Power of attorney (see page II-4). 25(a) Statement of Eligibility of the Corporate Trustee on Form T-1. 25(b) Statement of Eligibility of Stanley Burg on Form T-2. 25(c) Statement of Eligibility of the Indenture Trustee on Form T-1. - ----------- * Incorporated by reference herein as indicated. + To be filed by amendment or pursuant to a report to be filed pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 if applicable. II-7