X0306 4 2015-03-25 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2015-03-25 4 S 0 600 47.8167 D 9074 I By Trust Common Stock 10880.799 I See Footnote Sale prices of these shares ranged from $47.7000 to $47.9400, resulting in an average price of $47.8167. 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 2015-03-25