X0303 4 2011-06-03 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2011-03-02 5 G 0 1197 0 D 10006.706 D Common Stock 2011-03-02 5 G 0 1197 0 A 21831.881 I See Footnote Common Stock 2011-06-03 4 S 0 5000 43.9922 D 5006.706 D Common Stock 7438 I By Trust Reflects shares that have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. The sale of Northwest Natural Gas Company stock took place in 5 separate broker transactions occuring on June 3, 2011. 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 $43.970 - $44.00. 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. Shawn M. Filippi, Attorney-in-Fact 2011-06-07