Columbia Banking System, Inc. (COLB) President and Chief Executive Officer to Ring the NASDAQ Stock Market Closing Bell


ADVISORY, Sept. 7, 2007 (PRIME NEWSWIRE) --



 What:
 Melanie J. Dressel, President and Chief Executive Officer of Columbia
 Banking System, Inc. (COLB), will preside over the closing bell.

 Where:
 NASDAQ MarketSite - 4 Times Square - 43rd and Broadway - Broadcast Studio

 When:
 Monday, September 10, 2007 at 4:00 p.m. ET

 Contacts:
 JoAnne Coy
 Vice President, Corporate Communications,
 Investor and Community Relations
 253-305-1965; jcoy@columbiabank.com


 NASDAQ MarketSite:
 Jolene Libretto; 646.441.5220; mobile - 347.219.9539
 Jolene.Libretto@NASDAQ.com

Feed Information:

The closing bell is available from 3:50 p.m. to 4:05 p.m. on Galaxy 26. The downlink frequency is 4040 Vertical; Audio 6.2-6.8. The feed can also be found on Waterfront fiber 1623. If you have any questions, please contact Jolene Libretto at (646) 441-5220.

Radio Feed:

An audio transmission of the closing bell is also available from 3:50 p.m. to 4:05 p.m. on uplink IA6 C band / transponder 24, downlink frequency 4180 horizontal. The feed can be found on Waterfront fiber 1623 as well.

Webcast:

A live Webcast of the NASDAQ Closing Bell will be available at: http://www.nasdaq.com/reference/marketsite_about.stm

Photos:

To obtain a hi-resolution photograph of the Market Close, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market close of your choice.

About Columbia Banking System, Inc. (COLB):

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is a 53-branch Tacoma-based bank holding company whose wholly owned banking subsidiaries are Columbia Bank and Bank of Astoria. Columbia Bank is a Washington state-chartered full-service commercial bank. With the July 23, 2007 completion of the acquisitions of Mountain Bank Holding Company and Town Center Bancorp, Columbia Bank has 48 banking offices in Pierce, King, Cowlitz, Kitsap and Thurston counties in Washington State, and Clackamas and Multnomah counties in Oregon. Included in Columbia Bank are former branches of Mt. Rainier National Bank, doing business as Mt. Rainier Bank, with 7 branches in King and Pierce counties. Bank of Astoria, a federally insured commercial bank headquartered in Astoria, Oregon, operates four branches in Clatsop County: Astoria, Warrenton, Seaside and Cannon Beach; and one branch in Manzanita in Tillamook County. More information about Columbia can be found on its website at www.columbiabank.com.

Columbia's strong commitment to highly personalized service, varied products and long-standing community presence attracts experienced, talented bankers. Our bankers work closely with our customers, emphasizing personalized, local decision-making in each of the markets they serve. Columbia offers the varied menu of relationship banking products and sophistication of a regional bank, while retaining the appeal and service level of a community bank.


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