0001193125-07-160682 S-8 8 20070724 20070724 20070724 COLUMBIA BANKING SYSTEM INC 0000887343 6022 911422237 WA 1231 S-8 33 333-144811 07996034 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 S-8 1 ds8.htm REGISTRATION STATEMENT EX-5.1 2 dex51.htm OPINION OF GRAHAM & DUNN PC EX-23.2 3 dex232.htm CONSENT OF DELOITTE & TOUCHE LLP EX-99.1 4 dex991.htm MOUNTAIN BANK HOLDING COMPANY DIRECTOR STOCK OPTION PLAN EX-99.2 5 dex992.htm FORM OF NONEMPLOYEE DIRECTOR STOCK OPTION AGREEMENT EX-99.3 6 dex993.htm MOUNTAIN BANK HOLDING COMPANY 1999 EMPLOYEE STOCK OPTION PLAN EX-99.4 7 dex994.htm FORM OF EMPLOYEE STOCK OPTION AGREEMENT EX-99.5 8 dex995.htm MT. RAINIER NATIONAL BANK 1990 STOCK OPTION PLAN