X0304 4 2012-02-29 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001538965 Weber David A. 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 Pres. & CEO of Issuer's Sub. Common Stock 2012-02-29 4 F 0 121 0 D 553.067 D Common Stock 5086.8825 I See Footnote Common Stock 1049.636 I See Footnote Employee Stock Option to Buy 34.29 2016-02-29 Common Stock 625 625 D Employee Stock Option to Buy 44.48 2017-02-28 Common Stock 2000 2000 D Employee Stock Option to Buy 43.29 2018-03-06 Common Stock 2000 2000 D Employee Stock Option to Buy 41.15 2019-03-04 Common Stock 2000 2000 D Employee Stock Option to Buy 44.25 2020-03-02 Common Stock 2000 2000 D Employee Stock Option to Buy 45.74 2021-03-02 Common Stock 3000 3000 D Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 23, 2012. Held in reporting person's account under issuer's Retirement K Savings Plan as of February 29, 2012. 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 pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan") and is fully vested. Option was granted for 2,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan") and is fully vested. Option was granted for 2,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan") and is fully vested. Option was granted for 2,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 500 shares on each February 25, 2010 and January 1, 2011, 2012 and 2013. Option was granted for 2,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 500 shares on each February 24, 2011 and January 1, 2012, 2013 and 2014. Option was granted for 3,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 750 shares on each February 23, 2012 and January 1, 2013, 2014 and 2015. Shawn M. Filippi Attorney-in-Fact 2012-03-02