X0303 4 2010-03-23 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2010-03-23 4 M 0 6000 44.48 A 19000 D Common Stock 2010-03-23 4 S 0 6000 46.9113 D 13000 D Common Stock 2010-03-23 4 S 0 1000 47.00 D 11431 I By Trust Common Stock 22518.4510 I See Footnote Employee Stock Option to Buy 44.48 2010-03-23 4 M 0 6000 0 D 2011-12-31 Common Stock 13000 7000 D Employee Stock Option to Buy 34.29 2011-12-31 Common Stock 23000 23000 D Employee Stock Option to Buy 43.29 2011-12-31 Common Stock 25000 25000 D The sale of Northwest Natural Gas Company stock took place in 62 seperate broker transactions occurring on 3/23/2010. The price in column 4 represents the weighted average sale price for the transactions reported on this line. The range of prices for these transactions was $46.90 -$46.92. Northwest Natural Gas Company will provide upon request by the Commission staff or a security holder of Northwest Natural Gas Company full information regarding the number of shares purchased or sold at each separate price. These shares are held in a trust for the benefit of the reporting person's spouse. The filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose. Reflects shares that have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Option was granted for 23,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vested in installment of 5,750 shares on February 21, 2008. Pursuant to the Plan, the remaining 17,250 shares became fully exercisable upon Mr. Dodson's retirement on December 31, 2008. The option expires on December 31, 2011. Option was granted for 23,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vested in installments of 5,750 shares on each February 22, 2007 and January 1, 2008. Pursuant to the Plan, the remaining 11,500 shares became fully exercisable upon Mr. Dodson's retirement on December 31, 2008. The option expires on December 31, 2011. Option was granted for 25,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). Pursuant to the Plan, the remaining 25,000 shares became fully exercisable upon Mr. Dodson's retirement on December 31, 2008. The option expires on December 31, 2011. MardiLyn Saathoff, Attorney-in-Fact 2010-03-25