Exhibit 99.1

          COLUMBIA BANCORP ISSUES FIRST QUARTER 2007 FINANCIAL GUIDANCE

    THE DALLES, Ore., April 6 /PRNewswire-FirstCall/ -- Columbia Bancorp
(Nasdaq: CBBO), the financial holding company for Columbia River Bank, issued
guidance today estimating that its first quarter 2007 diluted earnings is
expected to be $0.33 to $0.35 per share. This estimate is lower than current
analyst expectations.

    Columbia's earning performance in the first quarter is being impacted
primarily by compression of the net interest margin, which management believes
is a consistent issue facing banks across the country. As we continue to
experience a stationary Fed Funds rate and hear uncertain economic news about
the housing market and volatile oil prices, management expects our yield on
earning assets to remain fairly flat for the remainder of 2007. This forecast is
based on an expectation the Fed Funds rate will remain unchanged. We also expect
increasing competition for core deposits, which will likely cause an increase in
our cost of funds.

    Although Columbia Bancorp's net interest margin has generally been above
average among our peer group in the past, management expects margin compression
will continue, resulting in earnings performance more in line with industry
peers.

    Also contributing to earnings performance is our provision for loan losses
which is expected to be in the range of $950,000 and $1,050,000 for the first
quarter of 2007. Our provision will reflect adjustments to the allowance for
loan losses resulting in part from a $1 million charge-off of a loan to a single
borrower. As of March 30, 2007, a settlement was reached between Columbia River
Bank and the borrower and based on this settlement and our reserve allocation,
management believes that Columbia is sufficiently reserved for this settlement.
Columbia continues to maintain overall healthy credit quality and strong loan
growth.

    "With the steady growth in our Pacific Northwest economy sustaining consumer
confidence in the region, we are confident we will continue to move the
organization forward in its commitment to being the Bank of choice for our
customers, shareholders and employees," stated Roger Christensen, Chief
Executive Officer and President. "We remain committed to our strategic plans in
order to build long-term value."

    ABOUT COLUMBIA BANCORP

    Columbia Bancorp (www.columbiabancorp.com) is the financial holding company
for Columbia River Bank, which operates 21 full-service branches located in The
Dalles (2), Hood River, Bend (3), Madras, Redmond (2), Pendleton, Hermiston,
McMinnville, Lake Oswego, 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 contains various forward-looking statements about plans
and anticipated results of operations and financial condition relating to
Columbia Bancorp. These statements include statements about Management's present
plans and intentions about our strategy, growth, and deployment of resources,
and about Management's expectations for future financial performance. Readers
can sometimes identify forward-looking statements by the use of prospective
language and context, including words like "may," "will," "should," "expect,"
"anticipate," "estimate," "continue," "plans," "intends," or other similar
terminology. 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.

SOURCE  Columbia Bancorp
    -0-                             04/06/2007
    /CONTACT:  Roger L. Christensen, President and CEO, +1-541-298-6633, or
rchristensen@columbiabancorp.com, or Greg B. Spear, Executive Vice President
and CFO, +1-541-298-6612, or gspear@columbiabancorp.com, both of Columbia
Bancorp/
    /Web site:  http://www.columbiabancorp.com/
    (CBBO)