0000887343-00-000014 S-8 4 20000628 20000628 COLUMBIA BANKING SYSTEM INC 0000887343 6035 911422237 WA 1231 S-8 33 333-40316 663485 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 S-8 1 0001.txt FORM S-8 EX-5.1 2 0002.txt OPINION OF DAVIS WRIGHT TREMAINE, LLP EX-23.1 3 0003.txt INDEPENDENT AUDITORS' CONSENT EX-24 4 0004.txt POWER OF ATTORNEY