X0303 5 2010-12-31 0 0 0000887343 COLUMBIA BANKING SYSTEM INC COLB 0001397948 Roberts Kent 1301 "A" STREET, MS 3100, STE 800 TACOMA WA 98402 0 1 0 0 Executive Vice President Common Stock 19312 D Common Stock 5270 I 401k Reflects change in 401(k) year end balance /s/ Cathleen L Dent 2011-02-09