EXHIBIT 4(d)



   ===========================================================================

                          NORTHWEST NATURAL GAS COMPANY


                                        TO


                              BANKERS TRUST COMPANY


                                       AND


            STANLEY BURG (SUCCESSOR TO R. G. PAGE AND J. C. KENNEDY),

                            As Trustees under the Mortgage and
                                      Deed of Trust, dated as of July 1, 1946,
                                      of  Portland  Gas  & Coke  Company  (now
                                      Northwest Natural Gas Company)





                         _________ SUPPLEMENTAL INDENTURE
                        PROVIDING, AMONG OTHER THINGS, FOR
                  FIRST MORTGAGE BONDS, _____% SERIES DUE _____


                              _____________________



                           DATED AS OF ________________


   ===========================================================================

   
                        __________ SUPPLEMENTAL INDENTURE

                  INDENTURE, dated as of the ___ day of __________, made and
   entered into by and between NORTHWEST NATURAL GAS COMPANY (formerly
   Portland Gas & Coke Company), a corporation of the State  of Oregon, whose
   post office address is One Pacific Square, 220 N.W. Second Avenue,
   Portland, Oregon 97209 (hereinafter sometimes called the Company), party of
   the first part, and BANKERS TRUST COMPANY, a corporation of the State of
   New York, whose post office address is Four Albany Street, New York, New
   York 10006 (hereinafter sometimes called the Corporate Trustee) and STANLEY
   BURG (successor to R. G. PAGE and J. C. KENNEDY), whose post office address
   is c/o Bankers Trust Company, Four Albany Street, New York, New York 10006
   (hereinafter sometimes called the Co-Trustee), parties of the second part
   (the Corporate Trustee and the Co-Trustee being hereinafter together
   sometimes called the Trustees), as Trustees under the Mortgage and Deed of
   Trust, dated as of July 1, 1946 (hereinafter called the Mortgage), executed
   and delivered by Portland Gas & Coke Company (now Northwest Natural Gas
   Company) to secure the payment of bonds issued or to be issued under and in
   accordance with the provisions of the Mortgage, this indenture (hereinafter
   called _________ Supplemental Indenture) being supplemental thereto;

                  WHEREAS the Mortgage was or is to be recorded in the
   official records of various counties in the States of Oregon and Washington
   which counties include or will include all counties in which this
   _____________ Supplemental Indenture is to be recorded; and

                  WHEREAS by the Mortgage the Company covenanted that it would
   execute and deliver such supplemental indenture or indentures and such
   further instruments and do such further acts as might be necessary or
   proper to carry out more effectually the purposes of the Mortgage and to
   make subject to the lien of the Mortgage any property thereafter acquired,
   made or constructed and intended to be subject to the lien thereof; and

                  WHEREAS the Company executed and delivered to the Trustees
   its First Supplemental Indenture, dated as of June 1, 1949 (hereinafter
   called its First Supplemental Indenture), its Second Supplemental
   Indenture, dated as of March 1, 1954 (hereinafter called its Second
   Supplemental Indenture), its Third Supplemental Indenture, dated as of
   April 1, 1956 (hereinafter called its Third Supplemental Indenture), its
   Fourth Supplemental Indenture, dated as of February 1, 1959 (hereinafter
   called its Fourth Supplemental Indenture), its Fifth Supplemental
   Indenture, dated as of July 1, 1961 (hereinafter called its Fifth
   Supplemental Indenture), its Sixth Supplemental Indenture, dated as of
   January 1, 1964 (hereinafter called its Sixth Supplemental Indenture), its
   Seventh Supplemental Indenture, dated as of March 1, 1966 (hereinafter
   called its Seventh Supplemental Indenture), its Eighth Supplemental
   Indenture, dated as of December 1, 1969 (hereinafter called its Eighth
   Supplemental Indenture), its Ninth Supplemental Indenture, dated as of
   April 1, 1971 (hereinafter called its Ninth Supplemental Indenture), its
   Tenth Supplemental Indenture, dated as of January 1, 1975 (hereinafter
   called its Tenth Supplemental Indenture), its Eleventh Supplemental
   Indenture, dated as of December 1, 1975 (hereinafter called its Eleventh
   Supplemental Indenture), its Twelfth Supplemental Indenture, dated as of
   July 1, 1981 (hereinafter called its Twelfth Supplemental Indenture), its
   Thirteenth Supplemental Indenture, dated as of June 1, 1985 (hereinafter
   called its Thirteenth Supplemental Indenture), its Fourteenth Supplemental
   Indenture, dated as of November 1, 1985 (hereinafter called its Fourteenth
   Supplemental Indenture), its Fifteenth Supplemental Indenture, dated as of
   July 1, 1986 (hereinafter called its Fifteenth Supplemental Indenture), its
   Sixteenth Supplemental Indenture, dated as of November 1, 1988 (hereinafter
   called its Sixteenth Supplemental Indenture), its Seventeenth Supplemental
   Indenture, dated as of October 1, 1989 (hereinafter called its Seventeenth
   Supplemental Indenture), its Eighteenth Supplemental Indenture, dated as of
   July 1, 1990 (hereinafter called its Eighteenth Supplemental Indenture),
   its Nineteenth Supplemental Indenture, dated as of June 1, 1991
   (hereinafter called its Nineteenth Supplemental Indenture); and
   
                  WHEREAS said First through Nineteenth Supplemental
   Indentures were filed for record, and were recorded and indexed, as a
   mortgage of both real and personal property, in the official records of
   various counties in the States of Oregon and Washington which counties
   include or will include all counties in which this  ____________
   Supplemental Indenture is to be recorded; and

                  WHEREAS the Company executed and delivered to the Trustees
   its Twentieth Supplemental Indenture, dated as of June 1, 1993 (hereinafter
   called its Twentieth Supplemental Indenture); and

                  WHEREAS said Twentieth Supplemental Indenture was filed for
   record, and was recorded and indexed, as a mortgage of both real and
   personal property, and financing statements were filed, in the official
   records of the several counties and other offices in the States of Oregon
   and Washington listed below, as follows:


   


                              IN THE STATE OF OREGON
                              ----------------------


                          Real Property Mortgage Records
                          ------------------------------


   Counterpart                                     Book, Film
       No.       County        Date Recorded         or Reel    Page
   ------------  ------        -------------       ----------   ----

       11        Benton       June 23, 1993        M-166017-93   -
                              June 29, 1993        M-166297-93   -
                                (re-recorded)
       12        Clackamas    June 22, 1993        93-43287     -
       13        Clatsop      June 23, 1993        816          534
       14        Columbia     June 23, 1993        93-5185      -
       15        Coos         June 30, 1993        93061396     -
       32        Douglas      June 24, 1993        1241         840
       17        Hood River   June 23, 1993        932082       -
       18        Lane         June 23, 1993        9338274      -
       19        Lincoln      June 23, 1993        263          1293
       20        Linn         June 23, 1993        645          804
       21        Marion       June 24, 1993        1074         290
       22        Multnomah    June 23, 1993        2711         1885
       23        Polk         June 25, 1993        270          245
       24        Tillamook    June 23, 1993        351          718
       25        Wasco        June 23, 1993        932338       -
       26        Washington   June 23, 1993        93049394     -
       27        Yamhill      June 23, 1993        F288P1700    -


                          Filed as a Financing Statement
                          ------------------------------

  Counterpart
       No.             Office           Date Filed for Record   File No.
   -----------         ------           ---------------------   -------

       9         Secretary of State       June 23, 1993        R61325


                            IN THE STATE OF WASHINGTON
                            --------------------------


                          Real Property Mortgage Records
                          ------------------------------

   Counterpart                                         Book, Film
       No.       County           Date Recorded          or Reel       Page
   ----------    ------           -------------         --------       ----

       29        Clark            June 24, 1993           399           1
       30        Klickitat        June 23, 1993           297           650
       31        Skamania         June 24, 1993           136           172


                         Filed as a Financing Statement
                         ------------------------------

   Counterpart
       No.           Office         Date Filed for Record     File No.
   -----------       ------         ---------------------     -------

       28      Secretary of State     June 25, 1993        93-176-0202


    
          
                  WHEREAS an instrument dated as of June 14, 1951, was
   executed by the Company appointing J. C. KENNEDY as Co-Trustee in
   succession to said R. G. PAGE (resigned) under the Mortgage and by J. C.
   KENNEDY accepting the appointment as Co-Trustee under the Mortgage in
   succession to the said R. G. PAGE, which instrument was recorded in various
   counties in the States of Oregon and Washington; and

                  WHEREAS, in the Ninth Supplemental Indenture STANLEY BURG
   was appointed by the Company as Co-Trustee under the Mortgage in succession
   to said J. C. KENNEDY (resigned) and in the Ninth Supplemental Indenture
   STANLEY BURG accepted such appointment as Co-Trustee under the Mortgage in
   succession to said J. C. KENNEDY; and

                  WHEREAS in addition to the property described in the
   Mortgage, as heretofore supplemented, the Company has acquired certain
   other property, rights and interests in property; and

                  WHEREAS, the Company has heretofore issued, in accordance
   with the provisions of the Mortgage, as supplemented, and on the date
   hereof there remain outstanding, the following series of First Mortgage
   Bonds:

                                                      Principal Amount
   Series                                                Outstanding  
   ------                                             ----------------

   9-1/8% Series due 2019..................              $25,000,000
   9-3/4% Series due 2015..................              $50,000,000
   Secured Medium-Term Notes, Series A.....              $55,000,000
   Secured Medium-Term Notes, Series B.....              $85,000,000
   ; and


          WHEREAS Section 8 of the Mortgage provides that the form of each
   series of bonds (other than the First Series) issued thereunder shall be
   established by Resolution of the Board of Directors of the Company; that
   the form of such series, as established by said Board of Directors, shall
   specify the descriptive title of the bonds and various other terms thereof;
   and that such Series may also contain such provisions not inconsistent with
   the provisions of the Mortgage as the Board of Directors may, in its
   discretion, cause to be inserted therein expressing or referring to the
   terms and conditions upon which such bonds are to be issued and/or secured
   under the Mortgage; and

          WHEREAS Section 120 of the Mortgage provides, among other things,
   that any power, privilege or right expressly or impliedly reserved to or in
   any way conferred upon the Company by any provision of the Mortgage,
   whether such power, privilege or right is in any way restricted or is
   unrestricted, may (to the extent permitted by law) be in whole or in part
   waived or surrendered or subjected to any restriction if at the time
   unrestricted or to additional restriction if already restricted, and the
   Company may enter into any further covenants, limitations or restrictions
   for the benefit of any one or more series of bonds issued thereunder, or
   the Company may cure any ambiguity contained therein or in any supplemental
   indenture or may (in lieu of establishment by Resolution as provided in
   Section 8 of the Mortgage) establish the terms and provisions of any series
   of bonds other than said First Series, by an instrument in writing executed
   and acknowledged by the Company in such manner as would be necessary to
   entitle a conveyance of real estate to record in all of the states in which
   any property at the time subject to the lien of the Mortgage shall be
   situated; and

          WHEREAS the Company now desires to create a new series of bonds and
   (pursuant to the provisions of Section 120 of the Mortgage) to add to its
   covenants and agreements contained in the Mortgage, as heretofore
   supplemented, certain other covenants and agreements to be observed by it
   and to alter and amend in certain respects the covenants and provisions
   contained in the Mortgage, as heretofore supplemented and amended; and

          WHEREAS the execution and delivery by the Company of this  ---------
   Supplemental Indenture, and the terms of the bonds of the ---------------
   Series hereinafter referred to, have been duly authorized by the Board of
   Directors of the Company by appropriate resolutions of said Board of
   Directors;
   
          NOW, THEREFORE, THIS INDENTURE WITNESSETH:

          That Northwest Natural Gas Company,  in consideration of the
   premises and of One Dollar to it duly paid by the Trustees at or before the
   ensealing and delivery of these presents, the receipt whereof is hereby
   acknowledged, and in further assurance of the estate, title and rights of
   the Trustees, and in order further to secure the payment both of the
   principal of and interest and premium, if any, on the bonds from time to
   time issued under the Mortgage, according to their tenor and effect, and
   the performance of all the provisions of the Mortgage (including any
   instruments supplemental thereto and any modification made as in the
   Mortgage provided) and of said bonds, hereby grants, bargains, sells,
   releases, conveys, assigns, transfers, mortgages, pledges, sets over and
   confirms (subject, however, to Excepted Encumbrances, as defined in Section
   6 of the Mortgage) unto Stanley Burg and (to the extent of its legal
   capacity to hold the same for the purposes hereof) to Bankers Trust
   Company, as Trustees under the Mortgage, and to their successor or
   successors in said trust, and to said Trustees and their successors and
   assigns forever, all property, real, personal and mixed, acquired by the
   Company after the date of the Mortgage, of the kind or nature specifically
   mentioned in Article XXI of the Mortgage or of any other kind or nature
   (except any herein or in the Mortgage expressly excepted) now owned or,
   subject to the provisions of subsection (I) of Section 87 of the Mortgage,
   hereafter acquired by the Company (by purchase, consolidation, merger,
   donation, construction, erection or in any other way) and wheresoever
   situated, including (without in anywise limiting or impairing by the
   enumeration of the same the scope and intent of the foregoing) all lands,
   gas plants, by-product plants, gas holders, gas mains and pipes; all power
   sites, water rights, reservoirs, canals, raceways, dams, aqueducts, and all
   other rights or means for appropriating, conveying, storing and supplying
   water; all rights of way and roads; all plants for the generation of
   electricity by steam, water and/or other power; all power houses, street
   lighting systems, standards and other equipment incidental thereto,
   telephone, radio, television and air-conditioning systems and equipment
   incidental thereto, water works, water systems, steam heat and hot water
   plants, substations, lines, service and supply systems, bridges, culverts,
   tracts, ice or refrigeration plants and equipment, offices, buildings and
   other structures and the equipment thereof; all machinery, engines,
   boilers, dynamos, gas, electric and other machines, regulators, meters,
   transformers, generators, motors, gas, electrical and mechanical
   appliances, conduits, cables, gas, water, steam heat or other pipes,
   service pipes, fittings, valves and connections, pole and transmission
   lines, wires, cables, tools, implements, apparatus, furniture and chattels;
   all franchises, consents or permits; all lines for the transmission and
   distribution of gas, electric current, steam heat or water for any purpose
   including mains, pipes, conduits, towers, poles, wires, cables, ducts and
   all apparatus for use in connection therewith; all real estate, lands,
   easements, servitudes, licenses, permits, franchises, privileges, rights of
   way and other rights in or relating to public or private property, real or
   personal, or the occupancy of such property and (except as herein or in the
   Mortgage, as heretofore supplemented, expressly excepted) all right, title
   and interest the Company may now have or may hereafter acquire in and to
   any and all property of any kind or nature wheresoever situated.
   
          TOGETHER WITH all and singular the tenements, hereditaments,
   prescriptions, servitudes and appurtenances belonging or in anywise
   appertaining to the aforementioned property or any part thereof, with the
   reversion and reversions, remainder and remainders and (subject to the
   provisions of Section 57 of the Mortgage) the tolls, rents, revenues,
   issues, earnings, income, product and profits thereof, and all the estate,
   right, title and interest and claim whatsoever, at law as well as in
   equity, which the Company now has or may hereafter acquire in and to the
   aforementioned property and franchises and every part and parcel thereof.

          IT IS HEREBY AGREED by the Company that, subject to the provisions
   of subsection (I) of Section 87 of the Mortgage, all the property, rights,
   and franchises acquired by the Company (by purchase, consolidation, merger,
   donation, construction, erection or in any other way) after the date
   hereof, except any herein or in the Mortgage, as heretofore supplemented,
   expressly excepted, shall be and are as fully granted and conveyed hereby
   and by the Mortgage, and as fully embraced within the lien hereof and the
   lien of the Mortgage, as supplemented, as if such property, rights and
   franchises were now owned by the Company and were specifically described
   herein or in the Mortgage, as heretofore supplemented, and conveyed hereby
   or thereby.  Provided that the following are not and are not intended to be
   now or hereafter granted, bargained, sold, released, conveyed, assigned,
   transferred, mortgaged, pledged, set over or confirmed hereunder and are
   hereby expressly excepted from the lien and operation of this _________
   Supplemental Indenture and from the lien and operation of the Mortgage, as
   heretofore supplemented, viz: (1) cash, shares of stock, bonds, notes and
   other obligations and other securities not hereafter specifically pledged,
   paid, deposited, delivered or held under the Mortgage, as heretofore
   supplemented, or covenanted so to be; (2) merchandise, equipment,
   apparatus, materials or supplies held for the purpose of sale or other
   disposition in the usual course of business; fuel, oil and similar
   materials and supplies consumable in the operation of any of the properties
   of the Company; all aircraft, tractors, rolling stock, trolley coaches,
   buses, motor coaches, automobiles, motor trucks, and other vehicles and
   materials and supplies held for the purpose of repairing or replacing (in
   whole or in part) any of the same; (3) bills, notes and accounts
   receivable, judgments, demands and choses in action, and all contracts,
   leases and operating agreements not specifically pledged under the
   Mortgage, as heretofore supplemented, or covenanted so to be; (4) the last
   day of the term of any lease or leasehold which may be or become subject to
   the lien of the Mortgage; (5) gas, petroleum, carbon, chemicals, light
   oils, tar products, electric energy, steam, water, ice, and other materials
   or products, manufactured, stored, generated, produced, purchased or
   acquired by the Company for sale, distribution or use in the ordinary
   course of its business; all timber, minerals, mineral rights and royalties
   and all Natural Gas and Oil Production Property, as defined in Section 4 of
   the Mortgage; and (6) the Company's franchise to be a corporation;
   provided, however, that the property and rights expressly excepted from the
   lien and operation of this _________ Supplemental Indenture and from the
   lien and operation of the Mortgage, as heretofore supplemented, in the
   above subdivisions (2) and (3) shall (to the extent permitted by law) cease
   to be so excepted in the event and as of the date that either or both of
   the Trustees or a receiver or trustee shall enter upon and take possession
   of the Mortgaged and Pledged Property in the manner provided in Article
   XIII of the Mortgage by reason of the occurrence of a Default as defined in
   Section 65 thereof.

          TO HAVE AND TO HOLD all such properties, real, personal and mixed,
   granted, bargained, sold, released, conveyed, assigned, transferred,
   mortgaged, pledged, set over or confirmed by the Company as aforesaid, or
   intended so to be, unto Stanley Burg and (to the extent of its legal
   capacity to hold the same for the purposes hereof) to Bankers Trust
   Company, as Trustees, and their successors and assigns forever.

          IN TRUST NEVERTHELESS, for the same purposes and upon the same
   terms, trusts and conditions and subject to and with the same provisos and
   covenants as are set forth in the Mortgage, as heretofore supplemented,
   this ________ Supplemental Indenture being supplemental thereto.

          AND IT IS HEREBY COVENANTED by the Company that all the terms,
   conditions, provisos, covenants and provisions contained in the Mortgage,
   as heretofore supplemented, shall affect and apply to the property
   hereinbefore described and conveyed, and to the estates, rights,
   obligations and duties of the Company and the Trustees and the
   beneficiaries of the trust with respect to said property, and to the
   Trustees and their successors in the trust, in the same manner and with the
   same effect as if the said property had been owned by the Company at the
   time of the execution of the Mortgage, and had been specifically and at
   length described in and conveyed to said Trustees by the Mortgage as a part
   of the property therein stated to be conveyed.

          The Company further covenants and agrees to and with the Trustees
   and their successors in said trust under the Mortgage, as follows:


                                    ARTICLE  I.

                         ______________ Series of Bonds.

          SECTION 1.01   There shall be a series of bonds designated "_______%
   Series due _______" (herein sometimes referred to as the "_____________
   Series"), each of which shall also bear the descriptive title "First
   Mortgage Bond", and the form thereof, which shall be established by
   Resolution of the Board of Directors of the Company, shall contain suitable
   provisions with respect to the matters hereinafter in this Article I
   specified.  Bonds of the  ______________ Series shall be issued from time
   to time as fully registered bonds in denominations of One Thousand Dollars
   and, at the option of the Company, in any multiple or multiples of One
   Thousand Dollars (the exercise of such option to be evidenced by the
   execution and delivery thereof).  Bonds of the _____ Series shall bear
   interest at the rate of ____ % per annum, payable semi-annually on _____
   and _____ of each year; and the principal of, and premium, if any, and
   interest on, each such bond shall be payable at the office or agency of the
   Company in the Borough of Manhattan, The City of New York, in such coin or
   currency of the United States of America as at the time of payment is legal
   tender for public and private debts.  Bonds of the _______________ Series
   shall be dated as in Section 10 of the Mortgage provided.
   
          (I)  Bonds of the ___________ Series shall be redeemable on and
   after  ______________ either at the option of the Company or pursuant to
   the requirements of the Mortgage, in whole at any time, or in part from
   time to time, prior to maturity, upon notice, as provided in Section 52 of
   the Mortgage, mailed at least thirty (30) days prior to the date fixed for
   redemption, at the following redemption prices, expressed in percentages of
   the principal amount of the bonds to be redeemed:

                            [Insert redemption prices]

   in each  case,  together  with  accrued interest  to  the  date  fixed  for
   redemption.

         (II)  At  the  option  of the  registered  owner,  any  bonds of  the
   _____________  Series, upon  surrender  thereof, for  cancellation, at  the
   office  or agency of the  Company in the Borough of  Manhattan, The City of
   New York, shall  (subject to the provisions of Section  12 of the Mortgage)
   be exchangeable  for a like aggregate principal amount of bonds of the same
   series of other authorized denominations.

          Transfers of  bonds of  the _____________  Series may  be registered
   (subject to the provisions of  Section 12 of the Mortgage) at the office or
   agency of the Company in the Borough of Manhattan, The City of New York.

          Upon  any registration  of  transfer or  exchange  of bonds  of  the
   ____________  Series, the Company may  make a charge therefor sufficient to
   reimburse it for any tax or taxes or other governmental charge, as provided
   in Section 12 of the Mortgage,  but the Company hereby waives any  right to
   make a  charge in  addition thereto  for  any registration  of exchange  or
   transfer of bonds of the ____________ Series.


                                    ARTICLE  II.

                            Miscellaneous Provisions.

          SECTION 2.01   No  bonds of  the  First through  Third Series  being
   Outstanding, as permitted in Section 3 of the Third Supplemental Indenture,
   the  amendment of subdivision  (A) of subsection  (II) of Section  4 of the
   Mortgage  made by Section 7  of the First  Supplemental Indenture hereby is
   excised from the Mortgage, as supplemented.

          SECTION 2.02   No  bonds of  the  First through  Ninth Series  being
   Outstanding, as permitted by Section 6 of the Ninth Supplemental Indenture,
   Article  XIX  of  the Mortgage,  as  supplemented,  hereby  is amended  and
   restated in the manner and form set forth in such Section 6.

          SECTION 2.03   No bonds  of the First through  Eleventh Series being
   Outstanding,  it is hereby  confirmed that, as provided  by Section 3.02 of
   the  Eleventh Supplemental Indenture, Section  64 of the  Mortgage has been
   excised from the Mortgage, as supplemented, effective as of the date of the
   retirement of all of the bonds of such Series.

          SECTION  2.04    Subject to  the  amendments  provided  for in  this
   ________  Supplemental  Indenture, the  terms defined in  the Mortgage,  as
   heretofore  supplemented,   shall,  for  all  purposes   of  this  ________
   Supplemental  Indenture, have  the meanings  specified in the  Mortgage, as
   heretofore supplemented.

          SECTION 2.05  The holders of bonds of the ___________ Series consent
   that the Company may, but  shall not be obligated to, fix a record date for
   the purpose of determining  the holders of bonds of  the ___________ Series
   entitled to  consent to any amendment,  supplement or waiver.   If a record
   date is fixed, those persons who were holders at such record date (or their
   duly  designated proxies),  and only  those persons,  shall be  entitled to
   consent to  such amendment, supplement  or waiver or to  revoke any consent
   previously given, whether or not such persons continue to be holders  after
   such  record date.   No such consent  shall be valid  or effective for more
   than 90 days after such record date.

          SECTION 2.06  The Trustees hereby accept the trusts hereby declared,
   provided, created  or supplemented, and agree to  perform the same upon the
   terms   and  conditions  herein   and  in   the  Mortgage,   as  heretofore
   supplemented, set forth, including the following:

          The Trustees shall not  be responsible in any manner  whatsoever for
   or  in  respect  of   the  validity  or  sufficiency  of   this  __________
   Supplemental  Indenture  or for  or in  respect  of the  recitals contained
   herein, all of which recitals  are made by the Company solely.   In general
   each and every term and condition contained in Article XVII of the Mortgage
   shall apply to  and form part of this ________  Supplemental Indenture with
   the same force and  effect as if  the same were herein  set forth in  full,
   with  such  omissions,  variations  and  insertions,  if  any,  as  may  be
   appropriate to make the same conform to the provisions of this ____________
   Supplemental Indenture.

          SECTION 2.07   Whenever  in this ___________  Supplemental Indenture
   any of the parties hereto  is named or referred to, this  shall, subject to
   the  provisions of  Articles XVI  and XVII  of the  Mortgage, be  deemed to
   include the successors or assigns of  such party, and all the covenants and
   agreements  in this __________  Supplemental Indenture  contained by  or on
   behalf of  the Company or  by or on behalf  of the Trustees  shall bind and
   inure to  the  benefit of  the respective  successors and  assigns of  such
   parties whether so expressed or not.

          SECTION  2.08   Nothing  in this  _________ Supplemental  Indenture,
   expressed or implied,  is intended, or shall be construed,  to confer upon,
   or  to give  to, any person,  firm or  corporation, other  than the parties
   hereto  and the  holders  of the  bonds and  coupons outstanding  under the
   Mortgage, any right, remedy, or claim under or by reason of this __________
   Supplemental Indenture or any  covenant, condition, stipulation, promise or
   agreement hereof, and all the covenants, conditions, stipulations, promises
   and  agreements  by or  on  behalf  of the  Company  as set  forth  in this
   __________  Supplemental  Indenture shall  be  for the  sole  and exclusive
   benefit of the  parties hereto, and of the holders of  the bonds and of the
   coupons outstanding under the Mortgage.

          SECTION  2.09    Except to the extent  specifically provided herein,
   no provision  of  this __________  Supplemental  Indenture is  intended  to
   reinstate  any provisions in the Mortgage which were amended and superseded
   by the  amendments to  the  Trust Indenture  Act of  1939  effective as  of
   November 15, 1990.

          SECTION  2.10    This  _________  Supplemental  Indenture  has  been
   executed  in  several identical  counterparts, each  of  which shall  be an
   original and all of which shall constitute but one and the same instrument.

          IN WITNESS WHEREOF,  Northwest Natural Gas Company,  party hereto of
   the first part, has caused  its corporate name to be hereunto  affixed, and
   this instrument to be signed and sealed by its President or one of its Vice
   Presidents, and its  corporate seal to be attested by  its Secretary or one
   of its  Assistant Secretaries  for and in  its behalf on  the _____  day of
   ________ , as of ______,  ____, in Portland, Oregon; Bankers Trust Company,
   one of the parties hereto of the second part, has caused its corporate name
   to be hereunto affixed, and this instrument to be  signed and sealed by one
   of  its Vice  Presidents or one  of its  Assistant Vice  Presidents and its
   corporate seal  to be attested by  one of its Assistant  Secretaries on the
   ____ day of ___________, as of _____________, in The City of  New York; and
   Stanley Burg,  one of the parties  hereto of the second  part, has hereunto
   set his hand and  affixed his seal, in The  City of New York, on  the _____
   day of ________ as of  ________________________.


                         NORTHWEST NATURAL GAS COMPANY



                         By_________________________________
                            


   
   Attest:

   _____________________________
          Secretary

   Executed,  sealed and  delivered by  
   NORTHWEST NATURAL  GAS COMPANY  in the
   presence of:


   ____________________________________



   ___________________________________



   
                         BANKERS TRUST COMPANY, as Trustee,



                         By____________________________

   



   Attest:


   _____________________
     Assistant Secretary



                                      _______________________________
                                      STANLEY BURG, as Trustee


   Executed, sealed and delivered 
   by BANKERS TRUST COMPANY and 
   STANLEY BURG in the presence 
   of:


   ___________________________


   ___________________________



   

   STATE OF OREGON            )
                              :   ss.:
   COUNTY OF MULTNOMAH        )

   ________________, A.D. _____.


                  Before  me personally  appeared _______________,  who, being
   duly sworn, did say that he is ______________________________, of NORTHWEST
   NATURAL GAS COMPANY  and that the seal affixed  to the foregoing instrument
   is the  corporate seal  of said  Corporation and that  said instrument  was
   signed and sealed in behalf  of said Corporation by authority of  its Board
   of Directors; and  he acknowledged said instrument to be  its voluntary act
   and deed.

                  On  this  _____ day  of  ___________,  before me  personally
   appeared      ____________________,     to      me     known      to     be
   ___________________________    of NORTHWEST NATURAL GAS COMPANY, one of the
   corporations  that  executed  the  within  and  foregoing  instrument,  and
   acknowledged said instrument  to be the free and voluntary  act and deed of
   said Corporation, for the uses and purposes therein mentioned, and on  oath
   stated that he was authorized to execute said instrument and  that the seal
   affixed is the corporate seal of said Corporation.

                  IN WITNESS WHEREOF I  have hereunto set my hand  and affixed
   my official seal the day and year first above written.



                                      ______________________________________
                                          
                                      ____________________________
                                      Notary Public - Oregon
                                      Commission No. ________
                                      My Commission Expires _____________



   

   STATE OF NEW YORK          )
                              :  ss.:
   COUNTY OF NEW YORK         )

   __________________, A.D. _____.


                  Before  me  personally appeared  ______________,  who, being
   duly sworn,  did say that he is  an ______________________ of BANKERS TRUST
   COMPANY  and that  the  seal affixed  to  the foregoing  instrument  is the
   corporate seal of  said Corporation and that said instrument was signed and
   sealed  in  behalf  of  said  Corporation by  authority  of  its  Board  of
   Directors; and he acknowledged said instrument to  be its voluntary act and
   deed.

                  On  this _____  day of  _____________, before  me personally
   appeared     ____________________,    to     me    known    to     be    an
   ________________________                     of BANKERS TRUST  COMPANY, one
   of  the corporations that executed the within and foregoing instrument, and
   acknowledged  said instrument to be the free  and voluntary act and deed of
   said  Corporation, for the uses and purposes therein mentioned, and on oath
   stated that  he was authorized to execute said instrument and that the seal
   affixed is the corporate seal of said Corporation.

                  IN WITNESS WHEREOF I  have hereunto set my hand  and affixed
   my official seal the day and year first above written.


                                      ___________________________
                                       
                                                      
                                      Notary Public, State of New York
                                      No. __________
                                      My Commission Expires ________


   

   STATE OF NEW YORK          )
                              :  ss.:
   COUNTY OF NEW YORK         )

   ___________________, A.D. _____.


                  Before me personally  appeared the above-named STANLEY  BURG
   and acknowledged the foregoing instrument to be his voluntary act and deed.
                     
                  On this day personally appeared before me STANLEY BURG to me
   known to  be the individual  described in and  who executed the  within and
   foregoing instrument, and acknowledged  that he signed the same as his free
   and voluntary act and deed, for the uses and purposes therein mentioned.

                  Given under my hand  and official seal this ________  day of
   ___________________.


                                           _________________________________
                                                 
                                                            
                                           Notary Public, State of New York
                                           No.______________
                                           My Commission Expires __________