NORTHWEST NATURAL GAS CO
S-3DPOS, 1998-07-14
NATURAL GAS DISTRIBUTION
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 14, 1998

                                                 Registration No. 333-32989
    

                          SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C.  20549

                                ---------------------
   
                            POST-EFFECTIVE AMENDMENT NO. 1
                                          TO
    
                                       FORM S-3
                                REGISTRATION STATEMENT
                                        UNDER
                              THE SECURITIES ACT OF 1933

                                ---------------------
                            NORTHWEST NATURAL GAS COMPANY
                (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.)

                     ONE PACIFIC SQUARE, 220 N.W. SECOND AVENUE, 
                                PORTLAND, OREGON 97209
                                     503-226-4211
               (Address, including zip code, and telephone number,
          including area code, of registrant's principal executive
          offices)

                                ---------------------
   
            RICHARD G. REITEN         BRUCE R. DeBOLT   JOHN T. HOOD, Esq.
               President               Senior Vice        Thelen Reid & 
                and Chief               President,          Priest LLP
            Executive Officer            Finance,       40 West 57th Street
           One Pacific Square            and Chief      New York, New York
         220 N.W. Second Avenue      Financial Officer         10019
         Portland, Oregon 97209     One Pacific Square     212-603-2000
              503-226-4211        220 N.W. Second Avenue
                                  Portland, Oregon  97209
                                       503-226-4211
    

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

                                ---------------------
   
    

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

   
    
                                
     <PAGE>

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



                            Northwest Natural Gas Company
                              DIVIDEND REINVESTMENT AND
                                 STOCK PURCHASE PLAN

                                     Common Stock

                                     -----------

          As more fully set forth herein, the Dividend Reinvestment and
          Stock Purchase Plan (the Plan) of Northwest Natural Gas Company
          (the Company) provides holders of the Company's common stock with
          a simple and convenient method of purchasing additional shares of
          common stock without payment of any brokerage commission or
          service charge. Any holder of record of the Company's common
          stock may join the Plan.

           Participants in the Plan may:

          -    have cash dividends on all of their shares automatically
               reinvested; or

          -    have cash dividends on only a part of their shares
               automatically reinvested; or

          -    invest by making optional cash payments of not more than
               $50,000 per calendar year and continue to receive cash
               dividends on shares registered in their names and held in
               certificate form; or

          -    invest both their cash dividends and such optional cash
               payments; or

          -    deposit certificates for shares of common stock registered
               in their names into the Plan for safekeeping and have cash
               dividends on all shares so deposited reinvested.

          Participants also may withdraw from the Plan at any time.

          All dividends on shares credited to a participant's account under
          the Plan will be automatically applied to the purchase of
          additional shares.

          Shares needed for the Plan may be purchased, at the option of the
          Company, from the Company, in the National Market tier of the
          Nasdaq Stock Market or through negotiated transactions. The price
          of shares purchased by participants in the Plan with reinvested
          dividends or with optional cash payments will be (i) in the case
          of authorized but unissued shares purchased from the Company, the
          average of the high and low trading prices as reported in the
          Nasdaq Stock Market on the Investment Date as defined in the
          Plan, and (ii) in the case of shares purchased in the open market
          or through negotiated transactions, the average price (excluding
          brokerage commissions) paid to obtain them.

   
          This Prospectus relates to 640,888 shares of common stock and the
          common share purchase rights appurtenant thereto of the Company
          registered for sale under the Plan. It is suggested that this
          Prospectus be retained for future reference.
    
                                     -----------
          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
          SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
          COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
          STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
          OF THIS PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A
          CRIMINAL OFFENSE.
                                     -----------
   
                     The date of this Prospectus is July 14, 1998
    

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

     <PAGE>

               
                                  TABLE OF CONTENTS

                                      Page                            Page
                                      ----                            ----
   
           Available Information . . .   1   Reports to Participants .   6
           Incorporation of Certain          Dividends . . . . . . . .   6
            Documents by Reference . .   1   Certificates for Shares .   6
           The Company . . . . . . . .   2   Withdrawal  . . . . . . .   6
           The Plan  . . . . . . . . .   2   Participation by Foreign and
             Purpose . . . . . . . . .   2    Other Holders Subject to
             Advantages  . . . . . . .   2    Withholding  . . . . . .   7
             Administration  . . . . .   2   Stock Dividends and Stock
             Custody of Plan Shares  .   3    Splits . . . . . . . . .   7
             Safekeeping . . . . . . .   3   Shareholder Voting  . . .   7
             Participation . . . . . .   3   Responsibility of the
             Reinvestment and Investment 4    Company  . . . . . . . .   8
             Enrollment  . . . . . . .   4   Suspension, Termination or
             Costs . . . . . . . . . .   5    Modification . . . . . .   8
             Purchases . . . . . . . .   5   Interpretation and
             Price of Shares . . . . .   5    Regulation . . . . . . .   8
             Number of Shares to be          Correspondence Regarding the
              Purchased  . . . . . . .   5    Plan . . . . . . . . . .   8
             Optional Cash Purchases .   5 Tax Consequences of
                                            Participation in the
                                            Plan . . . . . . . . . . .   8
                                           Use of Proceeds . . . . . .   9
                                           Description of Common Stock   9
                                           Experts . . . . . . . . . .  12
    


                                   ----------------


               NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO
          MAKE REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN OR
          INCORPORATED BY REFERENCE  IN  THIS  PROSPECTUS,  IN CONNECTION
          WITH  THE  OFFER CONTAINED IN THIS PROSPECTUS  AND,  IF  GIVEN 
          OR MADE,  SUCH  INFORMATION OR REPRESENTATIONS  MUST NOT BE
          RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY.  THIS
          PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION
          OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THOSE SPECIFICALLY
          OFFERED HEREBY OR AN OFFER TO SELL OR A SOLICITATION OF AN OFFER
          TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER
          OR SOLICITATION IS UNLAWFUL.  NEITHER THE  DELIVERY  OF THIS
          PROSPECTUS NOR  ANY  SALE  MADE HEREUNDER, UNDER  ANY
          CIRCUMSTANCES, SHALL CREATE ANY  IMPLICATION  THAT THERE  HAS
          BEEN  NO  CHANGE  IN  THE  AFFAIRS  OF THE COMPANY  SINCE THE
          DATE HEREOF OR THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY
          TIME SINCE ITS DATE.


                                   ----------------


     <PAGE>

                                AVAILABLE INFORMATION

            The Company is subject to the informational requirements of
          the Securities Exchange Act of 1934, as amended (the Exchange
          Act), and, in accordance therewith, files reports and other
          information with the Securities and Exchange Commission (the
          Commission). Reports, proxy statements and other information
          filed by the Company can be inspected and copied at the public
          reference facilities of the Commission, Room 1024, Judiciary
          Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, as well as
          at the following regional offices: Seven World Trade Center,
          Suite 1300, New York, New York 10048, and 500 West Madison
          Street, Suite 1400, Chicago, Illinois 60661. Copies of such
          material also can be obtained from the Public Reference Section
          of the Commission at 450 Fifth Street, N.W., Washington, D.C.
          20549, at prescribed rates.  The Commission maintains a Web site
          (http://www.sec.gov) that contains reports, proxy statements and
          other information filed electronically by the Company.

                   INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

            The following documents, filed by the Company with the
          Commission pursuant to the Exchange Act, are hereby incorporated
          by reference:
   
            1.    The Company's Annual Report on Form 10-K for the year
                  ended December 31, 1997;
    

   
            2.    The Company's Quarterly Report on Form 10-Q for the
                  quarter ended March 31, 1998;
    

   
            3.    The Company's Current Report on Form 8-K dated February
                  27, 1998; and
    

            4.    The Company's Registration Statement on Form 8-A dated
                  February 27, 1996.

   
            Each document filed subsequent to the date of this Prospectus
          pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act
          prior to the termination of the offering made by this Prospectus
          shall be deemed to be incorporated by reference in this
          Prospectus and shall be a part hereof from the date of filing of
          such document; provided, however, that the documents enumerated
          above or subsequently filed by the Company pursuant to Section 13
          of the Exchange Act prior to the filing with the Commission of
          the Company's most recent Annual Report on Form 10-K (Latest
          Annual Report) shall not be incorporated by reference in this
          Prospectus or be a part hereof from and after the filing of such
          Latest Annual Report.  Any statement contained in a document
          incorporated or deemed to be incorporated by reference herein
          shall be deemed to be modified or superseded, for purposes of
          this Prospectus, to the extent that a statement contained herein
          or in any other subsequently filed document which also is or is
          deemed to be incorporated by reference herein modifies or
          supersedes such statement.  Any statement so modified or
          superseded shall not be deemed, except as so modified or
          superseded, to constitute a part of this Prospectus.
    
               
            THE COMPANY HEREBY UNDERTAKES TO PROVIDE, WITHOUT CHARGE, TO
          EACH PERSON TO WHOM A COPY OF THIS PROSPECTUS SHALL HAVE BEEN
          DELIVERED, UPON THE WRITTEN OR ORAL REQUEST OF SUCH PERSON, A
          COPY OF ANY OR ALL OF THE DOCUMENTS REFERRED TO ABOVE WHICH HAVE
          BEEN OR MAY BE INCORPORATED IN THIS PROSPECTUS BY REFERENCE,
          OTHER THAN EXHIBITS TO SUCH DOCUMENTS UNLESS SUCH EXHIBITS SHALL
          HAVE BEEN SPECIFICALLY INCORPORATED BY REFERENCE INTO SUCH
          DOCUMENTS.   REQUESTS FOR SUCH COPIES SHOULD BE DIRECTED TO
          NORTHWEST NATURAL GAS COMPANY,  SHAREHOLDER SERVICES, 220 N.W. 
          SECOND AVENUE, PORTLAND, OREGON 97209, OR BY CALLING THE
          FOLLOWING NUMBER: 503-226-4211.


                                      1
     <PAGE>

                                     THE COMPANY
   
            Northwest Natural Gas Company is the issuer of the securities
          offered hereby.  The Company and its predecessors have supplied
          gas service to the public since 1859. The Company is principally
          engaged in the distribution of natural gas to customers in
          western Oregon and southwestern Washington, including the
          Portland metropolitan area.  Its executive offices are located at
          220 N.W. Second Avenue, Portland, Oregon 97209, and its telephone
          number is 503-226-4211.
    

                                       THE PLAN

            The following constitutes the Company's Dividend Reinvestment
          and Stock Purchase Plan (the Plan).

          PURPOSE

            The purpose of the Plan is to provide holders of common stock
          of the Company with a simple and convenient way of investing cash
          dividends and optional cash payments in shares of common stock
          without payment of any brokerage commission or service charge. 
          At the Company's option, shares purchased under the Plan will be
          (a) authorized but unissued shares purchased from the Company,
          (b) outstanding shares purchased in the market or through
          negotiated transactions, or (c) both.  To the extent that such
          shares will be purchased from the Company, the Company will
          receive additional funds for its continuing construction program
          and for general corporate purposes.

          ADVANTAGES

            Participants in the Plan may (a) have cash dividends on all or
          part of their common stock registered in their names
          automatically reinvested, or (b) reinvest their cash dividends
          and, in addition, invest up to $50,000 per calendar year through
          optional cash payments, or (c) continue to receive their cash
          dividends on shares registered in their names and invest by
          making such optional cash payments. No commission or service
          charge is paid by participants in connection with purchases under
          the Plan. The Company pays any brokerage fees for purchases and
          all costs of Plan administration.

            Full investment of funds is possible under the Plan because
          the Plan permits fractions of shares, as well as full shares, to
          be credited to participants' accounts.  In addition, dividends in
          respect of such fractions, as well as full shares, will be
          credited to participants' accounts and reinvested in additional
          shares of common stock.
               
            All shares purchased under the Plan will be credited to and,
          unless otherwise requested, held in participants' accounts under
          the Plan.  Shares held by the Agent and credited to participants'
          accounts are referred to as Plan Shares.  Participants who want
          to reinvest dividends on shares registered in their
          names (Registered Shares) also may elect to deposit such shares
          with the Agent for safekeeping, converting them to Plan Shares. 
          By holding their shares in their Plan accounts, participants are
          protected against loss, theft or destruction of stock
          certificates.  However, dividends on all Plan Shares must be
          automatically reinvested.  

            Statements reflecting each purchase for a participant will be
          furnished to that participant and will provide simplified
          recordkeeping.

          ADMINISTRATION

            The Company is the Agent for participants in the Plan and, as
          such, administers the Plan, keeps records, sends statements of
          account activity to participants and performs other duties


                                      2
     <PAGE>


          relating to the Plan.  At its option, the Company may appoint
          another agent to administer the Plan in whole or in part.

            The Agent will appoint a broker-dealer registered under the
          Securities Exchange Act of 1934 (Purchasing Representative) to
          act as independent agent for Plan participants in purchasing and
          selling shares for participants in the NASDAQ National Market or
          through negotiated transactions.  Subject to the objective of
          obtaining the lowest over-all cost of shares purchased, the
          Purchasing Representative will have full discretion as to all
          matters relating to purchases of shares.

          CUSTODY OF PLAN SHARES

            The Agent will hold for safekeeping the shares purchased for
          each participant until termination of participation in the Plan
          or until it receives a written request by a participant for the
          issuance of all or part of his shares.  Shares of common stock
          purchased under the Plan, as well as shares deposited with the
          Agent for safekeeping, will be registered in the name of the
          Agent or its nominee, as agent for participants in the Plan.  At
          its option, the Company may appoint another agent to act as
          custodian of the shares of common stock and of funds held under
          the Plan.

          SAFEKEEPING

            A participant may elect to deposit Registered Shares into his
          Plan account for safekeeping as Plan Shares.  Any lost
          certificates must be replaced before a participant may deposit
          the shares represented by such certificate.  Dividends on all
          shares deposited for safekeeping will be automatically
          reinvested.

            Certificates representing Registered Shares to be deposited
          for safekeeping should be sent, together with a completed
          Safekeeping Authorization Form, by registered mail to Northwest
          Natural Gas Company, Shareholder Services, 220 N. W. Second
          Avenue, Portland, Oregon 97209.  Certificates should not be
          endorsed.  A Safekeeping Authorization Form may be obtained from
          the Company at any time.

            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
          records relative to the cost of any shares represented by
          certificates deposited for safekeeping.  

          PARTICIPATION

            All holders of record of at least one share of common stock
          are eligible to participate in the Plan. In order to be eligible
          to participate in the Plan, a beneficial shareholder whose shares
          are held in the name of a bank or broker in  street name,  should
          request his or her bank or broker to have such shares registered
          in his or her name.  Alternatively, such beneficial shareholders
          may participate indirectly by requesting their brokers to
          participate on their behalf.  Such indirect participation must be
          through the registered holders of the shares.  
               
            Shareholders of record who desire the dividends on only some
          of their Registered Shares to be reinvested under the Plan may
          indicate such number of shares upon an Enrollment Card under
          "Partial Dividend Reinvestment."  This form of participation is
          not available with respect to Plan Shares, since dividends on all
          Plan Shares must be reinvested.

            A holder of record of common stock may join the Plan by
          signing an Enrollment Card and returning it to the Company.  A
          postage-paid envelope is provided for this purpose.


                                      3
     <PAGE>


            Shareholders of record may obtain an Enrollment Card from the
          Company at any time.
               

          REINVESTMENT AND INVESTMENT

            If an Enrollment Card is received on or before the record date
          for a dividend payment, reinvestment of dividends will begin with
          that dividend, unless the Enrollment Card indicates "Optional
          Cash Purchases Only."  If the Enrollment Card is received after
          the record date, reinvestment of dividends will begin with the
          next dividend payment date.  (Dividend payment dates ordinarily
          are the fifteenth day of February, May, August and November and
          corresponding record dates normally precede payment dates by 15
          days.)  If a certificate representing Registered Shares to be
          deposited for safekeeping, together with a completed Safekeeping
          Authorization Form, is received on or before the record date for
          a dividend payment, reinvestment of dividends on all such shares
          will begin with that dividend.  If such certificate and Form is
          received after the record date, reinvestment of dividends will
          begin with the next dividend payment date unless a participant
          already has elected "Full Dividend Reinvestment" for such shares.

            All optional cash payments received prior to any monthly
          "Investment Date" will be invested as of that Investment Date. 
          Optional cash payments received on or after any monthly
          "Investment Date" will be invested as of the next Investment
          Date.  The Investment Dates in February, May, August and November
          will be the dividend payment dates in those months.  In any other
          month, the Investment Date will be the 15th day of such month.
               
            For example, a dividend payable February 15 will be reinvested
          if a completed Enrollment Card, or a certificate and a completed
          Safekeeping Authorization Form, is received by the Company on or
          before the record date of January 31.  If the Enrollment Card, or
          such certificate and Form, 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.

            Likewise, any optional cash payments received on or before
          February 14 will be invested as of February 15.  If any optional
          cash payment is received after February 14, but on or before
          March 14, the investment will be made as of March 15.

          ENROLLMENT

            If the participant elects "Full Dividend Reinvestment," the
          Enrollment Card directs the Agent to apply to the purchase of
          additional shares under the Plan all of the participant's cash
          dividends on all of the participant's Registered Shares and Plan
          Shares. If a participant elects "Partial Dividend Reinvestment,"
          the Enrollment Card directs the Agent to apply to the purchase of
          additional shares under the Plan all of his cash dividends on
          that number of Registered Shares designated in the appropriate
          space on the Enrollment Card, as well as cash dividends on all of
          the participant's Plan Shares.  It also directs the Agent to
          apply any optional cash payments a participant might make to the
          purchase of additional shares in accordance with the Plan.  If a
          participant elects "Optional Cash Purchases Only" on the
          Enrollment Card, a participant will continue to receive cash
          dividends on Registered Shares in the usual manner, but the Agent
          will apply any optional cash payment received from him and
          dividends on Plan Shares to the purchase of additional shares
          under the Plan.


                                      4
     <PAGE>


          COSTS

            All costs of administration of the Plan are paid by the
          Company.  There are no brokerage fees on new shares purchased
          from the Company.  The Company pays all brokerage fees in
          connection with purchases made in the NASDAQ National Market or
          through negotiated transactions.  There will be a service charge
          for selling whole shares held in a participant's Plan account
          when requested by the participant.  Except for this service
          charge, there are no expenses in connection with withdrawal from
          the Plan.

          PURCHASES

            Shares purchased in any month directly from the Company will
          be purchased as of the Investment Date for that month.

            Shares purchased in any month in the NASDAQ National Market or
          through negotiated transactions will be purchased, at the
          discretion of the Purchasing Representative, during the period
          beginning on the tenth trading day prior to the Investment Date
          for that month and ending on the fifth trading day after the
          Investment Date.

          PRICE OF SHARES

            The "Purchase Price" of authorized but unissued shares
          purchased from the Company with reinvested dividends or with
          optional cash payments on any Investment Date will be the average
          of the high and low prices as reported on the NASDAQ National
          Market on the Investment Date (or the last trading day
          immediately preceding the Investment Date, if the NASDAQ National
          Market is closed on the Investment Date).

            The "Purchase Price" of shares purchased in respect of any
          Investment Date in the NASDAQ National Market or through
          negotiated transactions will be the average price (excluding
          brokerage fees) paid by the Purchasing Representative to obtain
          them.

          NUMBER OF SHARES TO BE PURCHASED

            The number of shares to be purchased depends on the amount of
          a participant's dividends or optional cash payments and the
          Purchase Price of the shares purchased with such funds.  Each
          participant's account will be credited with that number of
          shares, including fractions computed to three decimal places,
          equal to each participant's total amount to be invested divided
          by the Purchase Price.

          OPTIONAL CASH PURCHASES

            Optional cash payments received from a participant prior to
          the Investment Date for any month will be applied by the Agent to
          the purchase of shares as of the Investment Date for that month.
          DIVIDENDS PAYABLE ON ALL PLAN SHARES, INCLUDING THOSE PURCHASED
          AS A RESULT OF OPTIONAL CASH PAYMENTS, WILL BE AUTOMATICALLY
          REINVESTED UNDER THE PLAN.  Dividends on Registered Shares will
          not be reinvested if the participant has elected "Optional Cash
          Purchases Only" on the Enrollment Card.

            The option to make cash purchases is available to each
          participant at any time after joining the Plan. Optional cash
          purchases made by a participant cannot, in any calendar year,
          exceed a total of $50,000. There is no minimum amount required.
          Any amount received in excess of $50,000 per calendar year will
          be returned to the participant.


                                      5
     <PAGE>


            An optional cash purchase may be made by a participant when
          enrolling by enclosing a check or money order with the Enrollment
          Card.  Thereafter, optional cash purchases may be made through
          the use of a cash payment form sent to each participant
          periodically.  The same amount of money need not be sent each
          month and there is no obligation to make an optional cash
          purchase each month.

            In order to minimize accumulation of uninvested funds,
          optional cash payments will be invested monthly.

            Optional cash payments received by the Agent will be returned
          to the participants upon written request received by the Agent at
          any time prior to the Investment Date following their receipt. 
          NO INTEREST WILL BE PAID BY THE COMPANY OR THE AGENT ON CASH
          PAYMENTS WHILE THEY ARE HELD BY THE AGENT PENDING INVESTMENT.

          REPORTS TO PARTICIPANTS

            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 the Company's quarterly reports, annual
          report, notice of annual meeting and proxy statement, and income
          tax information form reporting dividends paid.

          DIVIDENDS

            A participant will be credited with dividends on all shares
          acquired under the Plan, including a fraction of a share.

          CERTIFICATES FOR SHARES

            Certificates for shares purchased under the Plan and any
          shares deposited with the Agent for safekeeping will be
          registered in the name of the Agent or its nominee and held for
          the accounts of participants.  No certificates will be issued to
          a participant for shares in his account unless he so requests the
          Agent in writing, or until his account is terminated.  At any
          time, except as otherwise provided in the fourth paragraph under
           Withdrawal  below, a participant may request the Agent to send
          him a certificate for any whole shares credited to his account. 
          Any remaining whole shares and fraction of a share will continue
          to be credited to the participant's account.

            Shares credited to the account of a participant under the Plan
          may not be pledged.  A participant who wishes to pledge such
          shares must request that a certificate for such shares be issued
          in his name.

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

            Participants' Plan accounts are maintained in the same names
          in which the participants' certificates were registered when they
          entered the Plan.  Certificates for whole shares withdrawn from
          the Plan will be registered similarly when issued.  

          WITHDRAWAL

            A participant may withdraw shares from the Plan by requesting
          either the issuance or sale of Plan Shares.

            In order to withdraw shares from the Plan, a participant must
          notify the Agent in writing that he wishes to withdraw.  When
          requested by a participant, or upon termination of the Plan by


                                      6
     <PAGE>


          the Company, a certificate for whole shares credited to his
          account under the Plan will be issued and a cash payment will be
          made for any fraction of a share.
               
            Upon his withdrawal from the Plan, a participant also may
          request that the Agent sell all or part of the whole shares
          credited to his account under the Plan.  Except as otherwise
          provided in the following paragraph, the sale will be made for
          his account within five business days after receipt of the
          request by the Agent.  The participant will receive the proceeds,
          less a service charge, and any applicable brokerage fees or
          commissions and any transfer tax, from the sale of the whole
          shares sold at his request and a cash payment for any fraction of
          a share credited to his account.

            A participant may withdraw from the Plan at any time,
          provided, however, that any notice of withdrawal received on or
          after an ex-dividend date for a dividend will not be effective
          until the dividend paid with respect to such ex-dividend date has
          been reinvested and the shares credited to the withdrawing
          participant's account.  (Ex-dividend dates ordinarily are the
          second business day prior to the record date. "Record dates" are
          described above under "Reinvestment and Investment".)

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

          PARTICIPATION BY FOREIGN AND OTHER HOLDERS SUBJECT TO WITHHOLDING

            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.

          STOCK DIVIDENDS AND STOCK SPLITS

            Any dividend payable in stock or split shares distributed by
          the Company on Plan Shares will be added 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.

          SHAREHOLDER VOTING

            Plan Shares, including fractional Plan Shares, will be voted
          as the participant directs.  

            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 the Company.  If the proxy card is not
          returned, the participant's shares may be voted only if the
          participant or a duly appointed representative votes in person at
          the meeting.


                                      7
     <PAGE>


          RESPONSIBILITY OF THE COMPANY

            Neither the Company nor any agent appointed by the Company
          with respect to 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 purchase or sale of shares.

          PARTICIPANTS SHOULD RECOGNIZE THAT THE COMPANY CANNOT ASSURE A
          PROFIT OR PROTECT AGAINST A LOSS ON THE SHARES PURCHASED OR SOLD
          UNDER THE PLAN.

          SUSPENSION, TERMINATION OR MODIFICATION

            Notwithstanding any other provision of the Plan, the Board of
          Directors of the Company reserves the right to amend, suspend,
          modify or terminate the Plan at any time.  Notice of any such
          amendment, suspension, modification or termination will be sent
          to all participants.

          INTERPRETATION AND REGULATION

            The officers of the Company are authorized to take such
          actions to carry out the Plan as may be consistent with the
          Plan's terms and conditions.

            The Company reserves the right to interpret and regulate the
          Plan as it deems desirable or necessary in connection with the
          Plan's operation.

          CORRESPONDENCE REGARDING THE PLAN 

            All correspondence concerning the Plan should be addressed to:

                  Northwest Natural Gas Company 
                  Shareholder Services 
                  220 N.  W.  Second Avenue 
                  Portland, Oregon 97209
                       (503) 220-2590
                             OR
                       1-800-422-4012, extension 3402


                    TAX CONSEQUENCES OF PARTICIPATION IN THE PLAN

            The current Federal income tax consequences to the participant
          will be as follows:

            With respect to reinvested cash dividends used to purchase
          authorized but unissued shares from the Company, 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 the
          Company, 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.


                                      8
     <PAGE>

               
            With respect to reinvested cash dividends used to purchase
          shares in the open market or through 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 plus brokerage commissions paid to obtain the shares.
          The cash reinvested plus brokerage commissions will be treated as
          dividend income to the participant to the extent of the current
          and accumulated earnings and profits of the Company, as
          determined for Federal income tax purposes. The basis of the
          shares so purchased will be equal to the amount of this
          distribution including the brokerage commissions paid by the
          Company.
               
            A participant who purchases shares with optional cash payments
          will recognize no taxable income upon such purchases except to
          the extent of brokerage fees paid by the Company to obtain the
          shares. The basis of shares purchased in this manner will be the
          amount of the optional cash payment plus brokerage fees.

            A participant will not realize any taxable income upon the
          distribution to him of certificates for whole shares credited to
          his 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 the Company 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 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 the Company, the net proceeds from
          their sale will be added to the general funds of the Company and
          will be used to finance in part its continuing utility
          construction program and for general corporate purposes. The
          Company expects its utility construction expenditures in 1998 to
          aggregate $90 million, and in the five-year period, 1998-2002, to
          aggregate between $500 million and $550 million.
    

   
            During the 12-month period ended May 31, 1998, the Company
          sold 198,943 authorized but unissued shares under the Plan for a
          total consideration of $ 5,195,400.
    


                             DESCRIPTION OF COMMON STOCK

            The following is a summary of certain rights and privileges of
          the common stock of the Company. The summary does not purport to
          be complete and is qualified in its entirety by reference to the
          Restated Articles of Incorporation and the Bylaws of the Company.
               
            The common stock offered pursuant to the Plan is part of the
          one class of common stock of the Company of the par value of $3
          1/6 per share.
               
            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.
          The Company's preferred stock and the preference stock are
          entitled in preference to the common stock (1) to cumulative


                                      9
     <PAGE>


          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: Should dividends on either the preferred
          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 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 the
          Company may issue long-term debt.

            Voting Rights and Classification of the Board of Directors: 
          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.

            The Board of Directors of the Company may consist of not less
          than nine nor more than 13 persons, as determined  by the Board.
          The current number is 12. The Board is divided into three
          classes, each equal in number. 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. 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's removal would be sufficient to
          elect such director if then cumulatively voted at an election 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's consent thereto shall
          be delivered to the Secretary of the Company 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. 

            Pre-emptive Rights: The holders of the common stock have no
          pre-emptive rights.

            Transactions with Related Persons: The Company 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 the Company) 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 the Company 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 the Company 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 the Company 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" includes a merger, consolidation, reorganization or
          recapitalization, a purchase, sale, lease, exchange or mortgage


                                      10
     <PAGE>

                                    
          of all or a substantial part (10% or more) of the property of the
          Company or a related person, an issuance, sale or exchange of
          securities and a liquidation, spin-off or dissolution; a "related
          person" includes a person, organization or group thereof owning
          ten percent or more of the capital stock of the Company;
          "continuing directors" are those (1) who were directors of the
          Company on April 9, 1984 and (2) those who became directors
          subsequent thereto and whose nomination for directorship shall
          have been approved 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 the
          Company (other than shares held by related persons).
               
            Transfer Agent and Registrar: The Company is the transfer
          agent and registrar for the common stock.  Both the transfer
          agent and the registrar are located in Portland, Oregon.
               
            Common Share Purchase Rights: The holders of the common stock
          have one common share purchase right (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.  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 twenty 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) the Company shall consolidate or merge
          with any other person, (ii) any person shall consolidate or merge
          with the Company and the Company shall be the surviving
          corporation and, in connection therewith, all or part of the
          common stock shall be changed into or exchanged for stock or
          other securities of any person (including the Company) or cash or
          any other property, or (iii) the Company shall sell or otherwise
          transfer, assets or earning power aggregating 50% or more of the
          assets or earning power of the Company 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 twenty 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 to a Person who attempts to acquire the
          Company on terms not approved by the Board of Directors.


                                      11
     <PAGE>

            This summary description of the Rights does not purport to be
          complete and is qualified in its entirety by reference to the
          Rights Agreement, a copy of which has been filed with the
          Commission.

                                       EXPERTS
   
            The financial statements incorporated in this Prospectus by
          reference to the Company's Annual Report on Form 10-K for the
          year ended December 31, 1997 have been so incorporated in
          reliance on the report of Price Waterhouse LLP, independent
          accountants, given on the authority of said firm as experts in
          auditing and accounting.
    

   
            The financial statements as of and for the years ended
          December 31, 1995 and 1996 incorporated in this Prospectus by
          reference to the Latest Annual Report have been audited by
          Deloitte & Touche LLP, independent auditors, as stated in their
          report, which is incorporated herein by reference, and have been
          so incorporated in reliance upon the report of such firm given
          upon their authority as experts in accounting and auditing.
    

   
            The statements made as to matters of law and legal conclusions
          in the documents incorporated in this Prospectus by reference and
          under "Description of Common Stock" herein have been reviewed by
          Mark S. Dodson, Esquire, Portland, Oregon.  Mr. Dodson is General
          Counsel of the Company.  These statements and conclusions are set
          forth in reliance upon the opinion of Mr. Dodson given upon his
          authority as an expert.  The statements made as to matters of law
          and legal conclusions under "Tax Consequences of Participation in
          the Plan" herein have been reviewed by Thelen Reid & Priest LLP,
          New York, New York.  These statements are set forth in reliance
          upon the opinion of Thelen Reid & Priest LLP given upon their
          authority as experts. As of May 31, 1998, Mr. Dodson owned 500
          shares of the Company's common stock.  Mr. Dodson has been
          granted options to purchase 5,000 shares at a price of $27.875. 
          Mr. Dodson's shares, including the underlying shares subject to
          options granted to him, had a fair market value at May 31, 1998
          of approximately $151,200.
    


                                      12
     <PAGE>


                                       PART II

          INFORMATION NOT REQUIRED IN PROSPECTUS

   
    

          ITEM 16.  LIST OF EXHIBITS


   
                      23.1 - Consent of Mark S. Dodson.

                      23.2 - Consent of PricewaterhouseCoopers LLP.

                      23.3 - Consent of Deloitte & Touche LLP.
    

                                 -----------------

   
    

                                      II-1
     <PAGE>


                                      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 post-effective amendment to be
          signed on its behalf by the undersigned, thereunto duly
          authorized, in the City of Portland, and State of Oregon on the
          13th day of July, 1998.
    



                                      NORTHWEST NATURAL GAS COMPANY

   
                                      By: /s/ Bruce R. DeBolt        
                                         -----------------------------
                                         Bruce R. DeBolt
                                         Senior Vice President, Finance,
                                         and Chief Financial Officer
    

   
                   Pursuant to the requirements of the Securities Act of
          1933 this post-effective amendment has been signed below by the
          following persons in the capacities and on the date indicated.
    

             Signature               Title                      Date
             ---------               -----                      ----
   
           /s/ Richard G. Reiten*    Principal Executive    July 13, 1998
           ----------------------    Officer, 
           Richard G. Reiten         and Director           
           President and Chief 
           Executive Officer


           /s/ Bruce R. DeBolt       Principal Financial    July 13, 1998
           -----------------------   Officer
           Bruce R. DeBolt           
           Senior Vice President, Finance,
           and Chief Financial Officer


           /s/ D. James Wilson*      Principal Accounting   July 13, 1998
           -----------------------   Officer
           D. James Wilson           
           Treasurer and Controller


           /s/ Mary Arnstad*
           -----------------------
           Mary Arnstad


           /s/ Thomas E. Dewey, Jr.*
           -----------------------
           Thomas E. Dewey, Jr.


           /s/ Tod R. Hamachek* 
           -----------------------
           Tod R. Hamachek


           /s/ Richard B. Keller* 
           -----------------------
           Richard B. Keller
                                     Directors              July 13, 1998

           /s/ Wayne D. Kuni*         
           -----------------------
           Wayne D. Kuni
    

                                      II-2
     <PAGE>

   
              
           -----------------------
           Randall C. Pape


           /s/Robert L. Ridgley* 
           -----------------------
           Robert L. Ridgley


           /s/ Dwight A. Sangrey*  
           -----------------------
           Dwight A. Sangrey


           /s/ Melody C. Teppola* 
           -----------------------
           Melody C. Teppola


           /s/ Russell F. Tromley*  
           -----------------------
           Russell F. Tromley


           /s/ Benjamin R. Whiteley*            
           -------------------------
           Benjamin R. Whiteley



          * By: /s/ Bruce R. DeBolt
              ------------------------------
           Bruce R. DeBolt
           Attorney-in-fact
    

                                      II-3
     <PAGE>


                                  INDEX TO EXHIBITS


                  Exhibit
                  -------



                   23.1     Consent of Mark S. Dodson.

                   23.2     Consent of PricewaterhouseCoopers LLP.

                   23.3     Consent of Deloitte & Touche LLP.



                                  -----------------





                       [LETTERHEAD OF MARK S. DODSON]



                                           July 13, 1998


     Northwest Natural Gas Company
     One Pacific Square
     220 N.W. Second Avenue
     Portland, Oregon  97209

     Dear Sirs:

           I hereby consent to the use of my name in the Prospectus
     included as part of Post-effective Amendment No. 1 to Northwest
     Natural Gas Company's Registration Statement on Form S-3 (Commission
     File No. 333-32989).

                                      Very truly yours,

                                      /s/ Mark S. Dodson

                                      MARK S. DODSON, ESQ.




                       CONSENT OF INDEPENDENT ACCOUNTANTS

     We hereby consent to the incorporation by reference in the Prospectus

     constituting part of this Registration Statement on Form S-3 of our

     report dated February 20, 1998, which appears on page 33 of Northwest

     Natural Gas Company's Annual Report on Form 10-K for the year ended

     December 31, 1997.  We also consent to the reference to us under the

     headings "Experts" in such Prospectus.




     PricewaterhouseCoopers LLP


     Portland, Oregon
     July 13, 1998







          INDEPENDENT AUDITORS' CONSENT


          We consent to the incorporation by reference in this Post-
          Effective Amendment No. 1 to Registration Statement (No. 333-32989)
          of Northwest Natural Gas Company on Form S-3 of our report dated 
          February 12, 1997, appearing in the Annual Report on Form 10-K of 
          Northwest Natural Gas Company for the year ended December 31, 1997,
          and to the reference to us under the heading "Experts" in the 
          Prospectus, which is part of such Registration Statement.


          /s/ Deloitte & Touche LLP

          DELOITTE & TOUCHE LLP

          Portland, Oregon
          July 13, 1998



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