X0303 4 2010-08-05 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001241405 ANDERSON DAVID HUGO 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 SVP & CFO Common Stock 2010-08-05 4 I 0 185.505 47.87 A 7284.372 I See Footnote Common Stock 28052.7160 D Common Stock 430.2223 I See Footnote Employee Stock Option to Buy 32.02 2014-09-27 Common Stock 16000 16000 D Employee Stock Option to Buy 34.29 2016-02-29 Common Stock 8000 8000 D Employee Stock Option to Buy 44.48 2017-02-28 Common Stock 7000 7000 D Employee Stock Option to Buy 43.29 2018-03-06 Common Stock 8000 8000 D Employee Stock Option to Buy 41.15 2019-03-04 Common Stock 8000 8000 D Employee Stock Option to Buy 44.25 2020-03-02 Common Stock 8000 8000 D Reflects shares that have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Shares have been credited to reporting person's account under the issuer's Retirement K Savings Plan as of July 31, 2010. Option was granted for 16,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option fully vested on January 1, 2007. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option fully vested on January 1, 2010. Option was granted for 7,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option vests in installments of 1,750 shares on each February 21, 2008 and January 1, 2009, 2010 and 2011. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option vests in installments of 2,000 shares on each February 27, 2009 and January 1, 2010, 2011 and 2012. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option vests in installments of 2,000 shares on each February 25, 2010 and January 1, 2011, 2012 and 2013. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan. The option vests in installments of 2,000 shares on each February 24, 2011 and January 1, 2012, 2013 and 2014. MardiLyn Saathoff, Attorney-in-Fact 2010-08-09