0001072613-00-001040 S-8 POS 3 20001122 20001122 COLUMBIA BANKING SYSTEM INC 0000887343 6035 911422237 WA 1231 S-8 POS 33 333-40316 775206 1102 BROADWAY PLAZA TACOMA WA 98402 2533051900 1102 BROADWAY PLAZA TACOMA WA 98402 S-8 POS 1 0001.txt COLUMBIA BANKING SYSTEM, INC. FORM S-8 EX-5.1 2 0002.txt OPINION OF DAVIS WRIGHT TREMAINE, LLP EX-23.1 3 0003.txt INDEPENDENT AUDITORS' CONSENT