X0306 4 2015-04-29 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2015-04-29 4 S 0 600 47.8395 D 6074 I By Trust Common Stock 10880.799 I See Footnote The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2015. The sale of Northwest Natural Gas Company stock occurred in 6 separate broker transactions on April 29, 2015. The sale prices of these shares ranged from $47.62 to $48.00, resulting in a weighted average price of $47.8395. Northwest Natural Gas Company will provide upon request by the Commission staff or a security holder of the issuer 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. Shawn M. Filippi, Attorney-in-Fact 2015-04-30