X0202 4 2006-07-31 0000887343 COLUMBIA BANKING SYSTEM INC COLB 0001186646 FOLSOM JOHN 1301 A STREET, STE. 800, MS-3100 TACOMA WA 98402-4200 1 0 0 0 Common Stock 2006-07-31 4 A 0 500 0 A 16468 D Common Stock 8550 I IRA Common Stock 950 I Spousal IRA NQSO (Right to Buy) 7.20 2005-02-23 4 M 0 2206 23.29 D 2000-04-23 2005-04-23 Common Stock 2206 6791 D NQSO (Right to Buy) 18.56 2001-04-22 2006-04-22 Common Stock 2101 6791 D NQSO (Right to Buy) 9.90 2003-06-28 2008-06-28 Common Stock 1820 6791 D NQSO (Right to Buy) 11.92 2004-05-15 2009-05-15 Common Stock 1820 6791 D NQSO (Right to Buy) 14.40 2006-04-23 2011-04-23 Common Stock 1050 6791 D Restricted Stock Award Cathleen Dent 2006-07-31