Columbia Bancorp (Nasdaq: CBBO), today announced Roger L. Christensen, President and Chief Executive Officer, and Craig Ortega, President and Chief Operating Officer of Columbia River Bank will present at the RBC Capital Markets Financial Institutions Conference on Wednesday, September 20, 2006 at 10:05 a.m. EDT (7:05 a.m. PDT). The presentation may be viewed at http://www.wsw.com/webcast/rbc55/cbbo/ or http://www.columbiabancorp.com .


The 2006 RBC Capital Markets Financial Institutions Conference will take place on September 20 and 21, at the Four Seasons Hotel in Boston, Massachusetts.


ABOUT COLUMBIA BANCORP


Columbia Bancorp ( http://www.columbiabancorp.com ) is the financial holding company for Columbia River Bank, which operates 20 branches located in The Dalles (2), Hood River, Bend (3), Madras, Redmond (2), Pendleton, Hermiston, McMinnville, Canby and Newberg, Oregon, and in Goldendale, White Salmon, Sunnyside, Yakima, Pasco and Richland, Washington. In addition, Columbia River Bank has three limited service branches located in retirement homes, one in Bend, Oregon and two in McMinnville, Oregon. To supplement its community banking services, Columbia River Bank also provides mortgage-lending services through Columbia River Bank Mortgage Team and brokerage services through CRB Financial Services Team.


FORWARD LOOKING STATEMENTS


This press release and the presentation referenced herein contain various forward-looking statements about plans and anticipated results of operations and financial condition relating to Columbia Bancorp. Because forward-looking statements are, in part, an attempt to project future events and explain management's current plans, they are subject to various risks and uncertainties that could cause our actions and our financial and operational results to differ materially from those set forth in such statements. These risks and uncertainties include, without limitation, our ability to estimate accurately the potential for losses inherent in our loan portfolio, economic and other factors that affect the collectibility of our loans, the impact of competition and fluctuations in market interest rates on Columbia's revenues and margins, and our ability to open and generate growth from new branches and to expand in new markets as we expect. Some of the other, risks and uncertainties that we have in the past, or that we may from time to time in the future, detail in our filings with the Securities and Exchange Commission ("SEC"). Information presented in this report is accurate as of the date the report was filed with the SEC, and we cannot undertake to update our forward- looking statements or the factors that may cause us to deviate from them, except as required by law.