Pricing supplement no. 5 Filing under Rule 424(b)(3) dated September 20, 2002 Registration No. 333-55366 (To prospectus dated February 27, 2001) $108,000,000 NORTHWEST NATURAL GAS COMPANY SECURED MEDIUM-TERM NOTES, SERIES B (A SERIES OF FIRST MORTGAGE BONDS) AND UNSECURED MEDIUM-TERM NOTES, SERIES B Due from Nine Months to 30 Years from Date of Issue CUSIP No.: 66765R BQ 8 Selling Agent(s): Merrill Lynch & Co. ----- UBS Warburg LLC X ----- Secured X Unsecured Banc One Capital Markets, Inc. X ----- ----- ----- Principal amount ($): $30,000,000 U.S. Bancorp Piper Jaffray Inc. X ----- Issue price (%): 100.000% Stated interest rate (%): 5.82% Selling Agent's commission (%): .750% Maturity date: September 24, 2032 Proceeds to Company (%): 99.250% Original issue date: September 24, 2002 Repayable at the option of holder: Yes No X Interest payment dates: June 1 and December 1, ----- ----- commencing December 1, 2002 Repayment Date: Not Applicable Regular record dates: May 15 and November 15 Repayment Price: Not Applicable Redeemable: Yes No X ----- ----- Election Period: Not Applicable In whole ----- Other Terms: Not Applicable In whole or in part ----- Initial redemption date: Not Applicable Initial redemption price: Not Applicable Reduction Percentage: Not Applicable Redemption limitation date: Not Applicable Agency Transaction |_|* or Principal Transaction |X|* Name of Principal(s): UBS Warburg LLC Banc One Capital Markets, Inc. U.S. Bancorp Piper Jaffray Inc. *If the Agency Transaction box is checked, the notes are being offered directly by Northwest Natural Gas Company through any Agent, acting as agent for Northwest Natural Gas Company. If the Principal Transaction box is checked, however, the notes have been sold to the Agent(s), as principal, for resale to purchasers upon terms described in the prospectus, dated February 27, 2001 and this pricing supplement. If the Principal Transaction box is checked, the notes are being offered by the Agent(s), as principal, at a price to the public set forth above under "Issue price (%)"; the notes were purchased by the Agent(s), as principal, from Northwest Natural Gas Company at the price set forth above under "Proceeds to Company (%)"; and the Agent(s) received a fee equal to the difference, which is set forth above under "Selling Agent's commission (%)" as a percentage of the principal amount of the notes. -------------------------------------- NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PRICING SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. --------------------------------------