X0303 4 2011-02-23 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2011-02-23 4 A 0 1197 0 A 11197 D Common Stock 7438 I By Trust Common Stock 20429.787 I See Footnote Shares are issuable as a result of satisfaction of performance goals for 2008-2010 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date. 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 2011-02-25