EXHIBIT 11 NORTHWEST NATURAL GAS COMPANY Statement Re: Computation of Per Share Earnings (Thousands, except per share amounts) (Unaudited) Three Months Nine Months Ended Ended September 30, September 30, ---------------- ---------------- 1995 1994 1995 1994 ------- ------- ------- ------- Earnings (Loss) Applicable to Common Stock $(5,038) $(4,520) $16,097 $15,228 Preference Stock Dividends - 37 - 112 Debenture Interest Less Taxes 133 135 400 404 ------- ------- ------- ------- Net Income (Loss) Available for Fully-Diluted Common Stock $(4,905) $(4,348) $16,497 $15,744 ======= ======= ======= ======= Average Common Shares Outstanding 14,760 13,322 14,459 13,267 Stock Options 8 19 7 19 Convertible Preference Stock - 104 - 104 Convertible Debentures 404 408 404 408 ------- ------- ------- ------- Fully-Diluted Common Shares 15,172 13,853 14,870 13,798 ======= ======= ======= ======= Fully-Diluted Earnings (Loss)Per Share of Common Stock $(0.32)* $(0.31)* $1.11 $1.14 ======= ======= ======= ======= *Anti-dilutive Note: Primary earnings per share are computed on the weighted daily average number of common shares outstanding each period. Outstanding stock options are common stock equivalents but are excluded from primary earnings per share computations due to immateriality.