COLUMBIA BANKING SYSTEM, INC. — Director's Dealing 2011

Jan 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COLUMBIA BANKING SYSTEM INC (COLB)
CIK: 0000887343
Period of Report: 2011-01-05

Reporting Person: DRESSEL MELANIE J (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-05	Common Stock	A	541	$15.948	Acquired	56745	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2408	Indirect
Common Stock	7450	Indirect
Common Stock	51134	Indirect

Footnotes

F1: ESPP Purchase