Exhibit 10(b)

                     1998 ESRIP CHANGE IN CONTROL AMENDMENT
                                       TO
                  EXECUTIVE SUPPLEMENTAL RETIREMENT INCOME PLAN
                                       OF
                          NORTHWEST NATURAL GAS COMPANY
                               (1995 Restatement)

         The Executive Supplemental Retirement Income Plan is amended to
implement action by the Board of Directors of Northwest Natural Gas Company on
September 24, 1998, effective on and after September 24, 1998.

1. Section 2.09 and the attached 1998 ESRIP Change in Control Appendix are added
   ------------
to incorporate benefit changes which apply to certain terminations of employment
that occur within 24 months after a change in control:

         2.09 Change in Control. The Plan benefits of any actively employed
              -----------------
  Participant who has a Qualified Termination of employment within twenty-four
  (24) months after a Change in Control shall be vested, determined and paid
  under the Plan as modified by the following provisions set forth in the
  attached 1998 ESRIP CHANGE IN CONTROL APPENDIX:

         Section                  Subject
         -------                  -------

         1.05A           "Final Average Compensation" defined 
                         (replaces 1.05).

         1.11(a)         Additional years of participation for benefit accrual 
                         credit (supplements 1.11).

         1.14            "Change in Control; Potential Change in Control; 
                         Person" defined.

         1.15            "Qualifying Termination" defined.

         2.01-2(b)(4)    Additional years of participation for benefit accrual 
                         credit (supplements 2.01-2(b)).

         2.02A           Change in eligibility to receive and the reduction 
                         percentage for early retirement (replaces 2.02).

         2.05A           Vesting (replaces 2.05).

         4.02A           No reduction of Change in Control benefits once a 
                         Potential Change in Control occurs (replaces 4.02).

         5.02A           Substitute 1.14 for previous definition of "change in 
                         control."



                      1998 ESRIP CHANGE IN CONTROL APPENDIX
                                       TO
                          NORTHWEST NATURAL GAS COMPANY
                  EXECUTIVE SUPPLEMENTAL RETIREMENT INCOME PLAN
                         (Effective September 24, 1998)

         The benefits of any actively employed Participant covered under the
Company's Executive Supplemental Retirement Income Plan (ESRIP) who has a
Qualified Termination of employment within twenty-four (24) months after a
Change in Control shall be vested, determined and paid under the Plan as
modified by the provisions set forth below in 1.05A, 1.11(a), 1.14, 1.15,
2.01-2(a)(4), 2.02A, 2.05A, and 4.02A:

1. Section 1.05A defining "final annual compensation" replaces Plan Section. 
   -------------
1.05 for any Participant who has a Qualifying Termination under 1.15:

         1.05A    "Final Annual Compensation: means:
                  --------------------------

                  1.05A-1 The annual salary of the Participant last approved by
the Board of Directors and being paid by the Company at the date of the
Qualified Termination;

                  1.05A-2 Plus the average annual performance award determined
by taking the sum of the awards (if any) paid on the three (3) consecutive March
1 award payment dates, which immediately precede the Qualifying Termination
date, and dividing such sum by three (3); provided, however, that if a
participant terminates employment during the 61-day period immediately preceding
March 1, and if the sum of the post termination performance award plus the two
(2) consecutive preceding awards is greater than the above determined 3-year
total of awards, such greater sum shall be divided by three (3) and used to
determine final average compensation;

                  1.05A-3 Without reduction under 1.05A-1 or 1.05A-2 for any
such amounts which are subject to a payment deferral election under the
Company's Executive Deferred Compensation Plan (effective January 1, 1987) or
Retirement K Savings Plan.

2. Section 1.11(a) is amended to cross reference new 2.01-2(b)(4):
   --------------

                           (a) Benefit Accrual. Service for benefit accrual
                               ---------------
         under 2.01 means years of actual participation, including service
         credited under 1.11(c), after becoming a Participant under this Plan,
         plus any additional years of benefit accrual credit earned or awarded
         pursuant to 2.01-2(b)(2), (3), or (4).

3. Section 1.14 is added to define "Change in Control," "Potential Change in
   ------------
Control" and "Person."

         1.14     Change in Control; Potential Change in Control; Person.
                  ------------------------------------------------------

                  1.14-1 Change in Control. For purposes of this Plan, a "Change
                  ------------------------
in Control" of the Company shall mean the occurrence of any of the events
described below in (a), (b) or (c), subject to the limitation described in (d):

                           (a)      The approval by the shareholders of the 
     Company of:

                                    (1) any consolidation, merger or plan of
                  share exchange involving the Company (a "Merger") in which the
                  Company is not the continuing or surviving corporation or
                  pursuant to which shares of Common Stock of the Company
                  ("Company Shares") would be converted into cash, securities or
                  other property, other than a Merger involving Company Shares
                  in which the holders of Company Shares immediately prior to
                  the Merger have the same proportionate ownership of common
                  stock of the surviving corporation immediately after the
                  Merger;

                                    (2) any sale, lease, exchange or other
                  transfer (in one transaction or a series of related
                  transactions) of all, or substantially all, the assets of the
                  Company; or

                                    (3) the adoption of any plan or proposal
                  for the liquidation or dissolution of the Company;

                           (b) At any time during a period of two (2)
         consecutive years, individuals who at the beginning of such period
         constituted the Board ("Incumbent Directors") shall cease for any
         reason to constitute at least a majority thereof; provided, however,
         that the term "Incumbent Director" shall also include each new director
         elected during such two-year period whose nomination or election was
         approved by two-thirds of the Incumbent Directors then in office; or

                           (c) Any Person (as hereinafter defined) shall, as a
         result of a tender or exchange offer, open market purchases or
         privately negotiated purchases from anyone other than the Company, have
         become the beneficial owner (within the meaning of Rule 13d-3 under the
         Securities Exchange Act of 1934), directly or indirectly, of securities
         of the Company ordinarily having the right to vote for the election of
         directors ("Voting Securities") representing twenty percent (20%) or
         more of the combined voting power of the then outstanding Voting
         Securities.

                           (d) Notwithstanding anything in the foregoing to the
         contrary, unless otherwise determined by the Board, no Change in
         Control shall be deemed to have occurred for purposes of this Plan for
         any Participant who (1) acquires (other than on the same basis as all
         other holders of Company Shares) an equity interest in an entity that
         acquires the Company in a Change in Control otherwise described above
         in (a), or (2) is part of a group that constitutes a Person which
         becomes a beneficial owner of Voting Securities in a transaction that
         otherwise would have resulted in a Change in Control described above in
         (c).

                  1.14-2 Potential Change in Control. For purposes of this Plan,
                         ---------------------------
a "potential Change in Control" of the Company shall be deemed to have occurred
if the following (a), (b) or (c) occurs:

                           (a) the Company enters into an agreement, the
         approval of which by the shareholders would result in the occurrence of
         a Change in Control of the Company;

                           (b) any Person (including the Company) publicly
         announces an intention to take or to consider taking actions which, if
         consummated, would constitute a Change in Control of the Company; or

                           (c) the Board adopts a resolution to the effect that,
         for purposes of this Plan, a potential Change in Control of the Company
         has occurred.

                  1.14-3 Person. For purposes of this Plan, the term "Person"
                         ------
shall mean and include any individual, corporation, partnership, group,
association or other "person," as such term is used in Section 14(d) of the
Securities Exchange Act of 1934 (the "Exchange Act"), other than the Company or
any employee benefit plan(s) sponsored by the Company.

4. Section 1.15 is added defining the termination of employment that qualifies
   ------------
for increased benefits in connection with a Change in Control:

         1.15 Qualifying Termination means the termination of the employment of
              ----------------------
any Participant within twenty-four (24) months after a Change in Control event
under 1.14, for a reason other than:

                           (a)  Participant's death;

                           (b)  termination after Participant's 62nd birthday;

                           (c)  disability (under 1.15-1)

                           (d)  termination by the Company for Cause (under 
         1.15-2); or

                           (e) termination by the Participant without Good
         Reason (defined in 1.15-3) based on an event occurring concurrent with
         or after a Change in Control.

                  1.15-1 Disability. Termination by the Company of Participant's
                         ----------
employment based on "Disability" shall mean termination because of absence from
duties with the Company on a full-time basis for one hundred eighty (180)
consecutive days as a result of Participant's incapacity due to physical or
mental illness, unless within thirty (30) days after Notice of Termination (as
hereinafter defined) is given following such absence Participant shall have
returned to the full-time performance of Company duties.

                  1.15-2 Cause. Termination by the Company of a Participant's
                         -----
employment for "Cause" shall mean termination upon:

                           (a) the willful and continued failure of Participant
         to perform substantially the reasonably assigned duties with the
         Company consistent with those duties assigned prior to the Change in
         Control (other than any such failure resulting from incapacity due to
         physical or mental illness) after a demand for substantial performance
         is delivered to Participant by the Chairman of the Board or Chief
         Executive Officer of the Company which specifically identifies the
         manner in which such executive believes that Participant has not
         substantially performed such duties; or

                           (b) the willful engaging by Participant in illegal
         conduct which is materially and demonstrably injurious to the Company.

                           (c) For purposes of 1.15-2, no act, or failure to
         act, shall be considered "willful" unless done, or omitted to be done,
         in knowing bad faith and without reasonable belief that the action or
         omission was in, or not opposed to, the best interests of the Company.
         Any act, or failure to act, based upon authority given pursuant to a
         resolution duly adopted by the Board or based upon the advice of
         counsel for the Company shall be conclusively presumed to be done, or
         omitted to be done, by Participant in good faith and in the best
         interests of the corporation. Notwithstanding the foregoing,
         Participant shall not be deemed to have been terminated for Cause
         unless and until there shall have been delivered a copy of the
         resolution duly adopted by the affirmative vote of not less than
         three-quarters of the entire membership of the Board at a meeting of
         the Board called and held for the purpose (after reasonable notice and
         an opportunity for Participant, together with Participant's counsel, to
         be heard before the Board), finding that in the good faith opinion of
         the Board, Participant was guilty of the conduct set forth above in (a)
         or (b), and specifying the particulars thereof in detail.

                  1.15-3   Good Reason.  Termination of a Participant's 
                           -----------
employment for "Good Reason" shall mean termination based on:

                           (a) a change in Participant's status, title,
         position(s) or responsibilities as an officer of the Company which, in
         Participant's reasonable judgment, does not represent a promotion from
         Participant's status, title, position(s) and responsibilities as in
         effect immediately prior to the Change in Control, or the assignment to
         Participant of any duties or responsibilities which, in Participant's
         reasonable judgment, are inconsistent with such status, title or
         position(s), or any removal of Participant from or any failure to
         reappoint or reelect Participant to such position(s), except in
         connection with the termination of Participant's employment for Cause,
         Disability or Retirement or as a result of Participant's death or by
         Participant other than for Good Reason;

                           (b) a reduction by the Company in Participant's base
         salary as in effect immediately prior to the Change in Control;

                           (c) the failure by the Company to continue in effect
         any Plan (as hereinafter defined) in which Participant is participating
         at the time of the Change in Control of the Company (or Plans providing
         Participant with at least substantially similar benefits) other than as
         a result of the normal expiration of any such Plan in accordance with
         its terms as in effect at the time of the Change in Control, or the
         taking of any action, or the failure to act, by the Company which would
         adversely affect Participant's continued participation in any of such
         Plans on at least as favorable a basis to Participant as is the case on
         the date of the Change in Control or which would materially reduce
         Participant's benefits in the future under any of such Plans or deprive
         Participant of any material benefit enjoyed by Participant at the time
         of the Change in Control. For purposes of this 1.15-3(c), "Plan" shall
         mean any compensation plan such as an incentive, stock option or
         restricted stock plan or any employee benefit plan such as a thrift,
         pension, profit sharing, deferred compensation, medical, disability,
         accident, life insurance, or relocation plan or policy or any other
         plan, program or policy of the Company intended to benefit employees.

                           (d) the failure by the Company to provide and credit
         Participant with the number of paid vacation days to which Participant
         is then entitled in accordance with the Company's normal vacation
         policy as in effect immediately prior to the Change in Control;

                           (e) the Company's requiring Participant to be based
         anywhere other than where Participant's office is located immediately
         prior to the Change in Control except for required travel on the
         Company's business to an extent substantially consistent with the
         business travel obligations which Participant undertook on behalf of
         the Company prior to the Change in Control;

                           (f) the failure by the Company to obtain from any
         Successor (as hereinafter defined) the assent to Participant's
         employment or severance agreement (if any); or

                           (g) any purported termination by the Company of
         Participant's employment which is not effected pursuant to a Notice of
         Termination satisfying the requirements of 1.15-4 ; and for purposes of
         this Plan, no such purported termination shall be effective.

                  1.15-4 Notice of Termination. Any purported termination by the
                         ---------------------
Company or by Participant following a Change in Control shall be communicated by
Written Notice of Termination to the other party. For purposes of this Plan, a
"Notice of Termination" shall mean a notice which shall indicate the specific
termination provision in this Plan relied upon and shall set forth in reasonable
detail the facts and circumstances claimed to provide a basis for termination of
Participant's employment under the provision so indicated.

                  1.15-5 Date of Termination. "Date of Termination" following a
                         -------------------
Change in Control shall mean (a) if Participant's employment is to be terminated
for a Disability, thirty (30) days after Notice of Termination is given
(provided that Participant shall not have returned to the performance of his
duties on a full-time basis during such thirty (30) day period, (b) if
Participant's employment is to be terminated by the Company for Cause, the date
on which a Notice of Termination is given, and (c) if Participant's employment
is to be terminated by Participant or by the Company for any other reason, the
date specified in the Notice of Termination, which shall be a date no earlier
than ninety (90) days after the date on which a Notice of Termination is given
(provided that if the termination is by Participant for Good Reason, the
circumstances giving rise to the Good Reason have not been fully corrected by
the specified date), unless an earlier date has been agreed to by the party
receiving the Notice of Termination either in advance of, or after, receiving
such Notice of Termination. Notwithstanding anything in the foregoing to the
contrary, if the party receiving the Notice of Termination has not previously
agreed to the termination, then within thirty (30) days after any Notice of
Termination is given, the party receiving such Notice of Termination may notify
the other party that a dispute exists concerning the termination, in which event
the Date of Termination shall be the date set either by mutual written agreement
of the parties or by the arbitrators in an arbitration proceeding as provided
under the Company's executive employment or severance agreements.

4. Section 2.01-2(b)(4) is added to increase the years of participation benefit
   -------------------
accrual by three (3) years for any Participant who has a Qualifying Termination
under 1.15:

                           (b)      Year of Participation means:
                                    ----------------------------
                                    (1) Each consecutive twelve (12) month
                  period of Company service measured by each anniversary of the
                  date of first becoming a Participant under this Plan.

                                    (2) All additional years of participation
                  credit awarded to a Participant by the Committee in the
                  exercise of its discretion.

                                    (3) All years of service credit earned for
                  Company service and awarded by the Committee for each of the
                  nine (9) Participants in the Plan on September 1, 1998, as set
                  forth in the attached 1998 ESRIP Appendix.

                                    (4) Three (3) additional years of
                  participation credit shall be awarded to any Participant who
                  has a Qualifying Termination (defined in 1.15) within
                  twenty-four (24) months after a Change in Control (defined in
                  1.14) pursuant to the 1998 ESRIP Change in Control Appendix.

5. Section 2.02A shall replace 2.02 regarding eligibility to receive and the
   -------------
award of the early retirement benefits for any Participant who has a Qualifying
Termination under 1.15:

         2.02A Early Retirement Supplemental Income. Any Participant who has a
               ------------------------------------
Qualifying Termination (defined in 1.15) within twenty-four (24) months after a
Change in Control (defined in 1.14) shall be entitled at or after age fifty-five
(55) to receive during Participant's lifetime the reduced monthly supplemental
retirement payments determined as follows:

                  2.02A-1 First, the total annual retirement pay at normal
retirement date shall be determined under 2.01-2 and -3, using the Participant's
final annual compensation and service at the time employment by the Company
ends.

                  2.02A-2 Second, the monthly supplemental payment under this
Plan starting at normal retirement date shall be determined under 2.01-4, using
the Participant's early annual retirement allowance payable at the normal
retirement date (under Retirement Plan 7.02-1), projected annual primary Social
Security benefit under the Retirement Plan, and annual retirement benefits under
the Executive Deferred Compensation Plan determined as a supplement to such
payment under the Retirement Plan.

                  2.02A-3 Third, if supplemental payments start before the
Participant's normal retirement date, to achieve the necessary reduction of the
target benefit under 2.01 and 2.02A-1, the monthly amount under 2.02A-2 shall be
reduced 0.25 percent (.0025) per month for each month of age during the period
starting on the date the first early retirement payment is to be made and ending
on Participant's 62nd birthday.

6. Section 2.05A shall replace 2.05 regarding the vested benefits of any
   -------------
Participant who has a Qualifying Termination under 1.15:

         2.05A Vested Benefits. Any Participant who has a Qualifying Termination
               ---------------
(defined in 1.15) within twenty-four (24) months after a Change in Control
(defined in 1.14) thereupon shall have a 100% vested and nonforfeitable right to
receive supplemental payments under this Plan starting as early as age 55 under
2.02A.

7. Section 4.02A replaces Section 4.02 and shall apply on and after the date
   -------------
there is a Potential Change in Control (defined in 1.14):

         4.02A Company. The Company, by action of the Board of Directors,
               -------
reserves the exclusive right to amend, modify, or terminate this Plan in whole
or in part without notice to any Participant; provided, however, that the Change
in Control benefits provided by the 1998 ESRIP Change in Control Amendment shall
not be diminished or eliminated (but may be increased) on and after the date
when the first Potential Change in Control (defined in 1.14-2) shall occur after
September 1, 1998. Any such termination, modification or amendment shall not
terminate nor diminish any rights or benefits accrued by any Participant or
surviving beneficiary prior thereto.

8. Section 5.02A replaces Section 5.02 to delete the "change of control"
   -------------
definition that is replaced by 1.14 and to affirm the change of control
provisions in this 1998 Amendment:

                  5.02A Legally Binding. The rights, privileges, benefits and
                        ---------------
obligations under this Plan are intended to be legal obligations of the Company
and binding upon the Company, its successors and assigns. The Company agrees it
will not be a party to any merger, consolidation or reorganization, unless and
until its obligations hereunder shall be expressly assumed by its successor or
successors. Notwithstanding any of the provisions of the Plan to the contrary,
upon a change of control (defined in 1.14), the cessation of the corporate
existence of the Company or the failure to continue such existence in full force
and effect as a result of any circumstances or event, each Participant shall be
entitled to receive any Plan benefits, as determined in accordance with the
terms and conditions of payment set forth in Articles II and III, and, if
applicable, the 1998 ESRIP Change in Control Appendix.

                                        NORTHWEST NATURAL GAS COMPANY

                           APPROVED:    By   /s/ R. G. Reiten                 
                                             --------------------------
                                             President and CEO

                           Date:             September 28, 1998

                              1998 ESRIP APPENDIX
                                       TO
                          NORTHWEST NATURAL GAS COMPANY
                  EXECUTIVE SUPPLEMENTAL RETIREMENT INCOME PLAN
                         (Effective September 24, 1998)

1.       Accrued Participation Credit and Vesting Credit under ESRIP 
         Section. 2.01-2 and 2.05
         ----------------------------------------------------------------------

         For purposes of ESRIP benefits, the following executives employed on
September 1, 1998, are entitled to the years of participation credit and vesting
credit set forth below on 9/1/98 based on credit earned for prior Company
service and credit awarded by the Board.

                                                     Years of      Years of
                                                   Participation    Vesting
                                                      Credit        Credit
      Executive                 Born       Hired     on 9/1/98    on 9/1/98
      ----------------------  --------    -------- -------------  ---------
      DeBolt, Bruce R.        12/07/47    02/15/80     18.55        18.55
      Dodson, Mark S.         01/26/45    09/15/97      0.96 (2)     0.96  (2)
      Foley, Dwayne L.        09/25/45    10/30/67     30.84        30.84
      Harper, William R., Jr. 10/09/53    12/07/92      5.74         5.74
      Johnston, Diana J.      12/16/44    05/20/66     32.29        32.29
      Kantor, Gregg S.        04/30/57    09/15/96      0.67         1.96
      McCoy, Michael S.       05/28/43    11/06/69     28.82        28.82
      Reiten, Richard G.      07/01/39    12/31/95     10.67 (1,2)   5.67  (3)
      Rue, Conrad J.          11/25/45    10/29/74     23.85        23.85


- --------

(1)  Years of participation include a Board grant of 8 years to Reiten.
                                                                               
(2)  Benefits also are subject to terms of Board approved Employment Agreement 
     for Dodson and Reiten.
                                                                               
(3)  Subject to Board approved amendment of Reiten's Employment Agreement 
     granting three (3) years of Vesting Credit.