X0202 4 2007-01-18 0000887343 COLUMBIA BANKING SYSTEM INC COLB 0001186640 DRESSEL MELANIE J 1 1 0 0 President and CEO Common Stock 2007-01-18 4 M 0 5519 11.77 A 28718 D Common Stock 2007-01-18 4 P 0 8488 11.77 A 23199 D Common Stock 6022 I 401k Common Stock 46932 I Family Trust LLC Common Stock 2408 I North Mason Fiber Common Stock 10 I Shares owned by son. Common Stock 10 I Shares owned by son. ISO (Right to Buy) 11.77 2007-01-18 4 P 0 8488 11.77 D 2002-01-20 2007-01-20 Common Stock 8488 12128 D NQSO (Right to Buy) 11.77 2007-01-18 4 M 0 5519 11.77 D 2002-01-20 2007-01-20 Common Stock 5519 20616 D NQSO (Right to Buy) 10.82 2003-12-03 2008-12-05 Common Stock 12128 29445 D /s/Cathleen Dent 2007-01-19