VOTE "For" the 'Merger' on MANAGEMENT'S
                               "WHITE" PROXY ONLY.

[Logo of Cohoes Bancorp Inc.]                [Logo of Hudson River Bancorp Inc.]

                                                                   July 20, 2000

Vote "For" the Cohoes/Hudson River 'Merger' and HELP create a POWERHOUSE Bank in
the 'Capital District'.......................................................and
tell TrustCo..."NO Thanks!"

Dear Shareholder:

      Recently we sent you a Proxy Statement asking you to vote in favor of our
'Merger of Equals' transaction. We are COMMITTED to the Cohoes/Hudson River
combination and believe that it is in the BEST interest of ALL of our
shareholders (many of whom are our friends, family members, employees & business
associates.)

Our COMBINED institution will create a POWERHOUSE Franchise in our local Banking
community!

In fact, the expected STRENGTH of this combination has our competition Fighting
to STOP us!

      One of our competitors, TrustCo, is trying to DISRUPT our merger by
sending you materials asking that you vote against our combination and
SUPPOSEDLY 'offering' to buy your stock.

Their 'offer' has a load of CONDITIONS (11 to be EXACT), many of which we
believe are IMPOSSIBLE to meet. In our opinion, their only REAL purpose in
mailing these materials is to DECEIVE our shareholders into defeating our Merger
because they are AFRAID of the COMPETITOR that we WILL become!

TrustCo ISN'T trying to "START SOMETHING"............................... they're
trying to 'STEAL SOMETHING'....................................specifically YOUR
companies!!!



Here are a few reasons WHY you should vote "FOR" the Cohoes/Hudson River Merger:

      o     We WILL create a POWERHOUSE Banking Franchise in the Capital
            District;

      o     Our combined 'Shareholder's Equity' will be $289 million,
            approximately 1.75X that of TrustCo;

      o     With $289 million in capital, we intend to CONTINUE STOCK
            REPURCHASES, CONTINUE INTERNAL GROWTH and INCREASE OUR QUARTERLY
            CASH DIVIDENDS;

      o     Our Merger will SIGNIFICANTLY INCREASE the 'earnings per share' that
            each of our companies would otherwise have had on its own.

Again, do NOT let TrustCo CONFUSE or DECEIVE you with their materials. We are
convinced that their SOLE strategy is to 'break-up' our deal.

- --------------------------------------------------------------------------------

We believe the Trustco offer will NEVER become a REALITY because:

      o     It is a HIGHLY CONDITIONAL offer (11 in all), and we believe some of
            the conditions are IMPOSSIBLE to satisfy;

      o     The 'currency' for their offer is OVERvalued TrustCo stock which is
            currently selling at approximately 380% of 'book value' AND creates
            the potential for HUGE downside risk;

      o     The acquisition 'premium' that they are offering is WHOLLY
            inadequate.

TrustCo will TRY to CONFUSE and TRICK you.......................................
 ............................................DON'T let them!!!



      Our Boards of Directors, once again, UNANIMOUSLY URGE you to COMPLETE,
SIGN, DATE and RETURN Management's "White" Proxy (another is enclosed) voting
"For" the 'Merger of Equals' and to THROW AWAY all "gold" OR "green" proxies
that you receive from TrustCo. Although each shareholder's vote can only be
counted once, we have been advised to collect as many individual proxies as we
can (from each of you) for security reasons.

                 The ONLY 'REAL DEAL' for Cohoes & Hudson River
                           Shareholders is OUR DEAL!

      We appreciate your consideration & loyalty and ASSURE you that we will
continue to do our BEST to MAXIMIZE your investment.

With kind personal regards,


/s/ Harry L. Robinson                               /s/ Carl A. Florio
- ----------------------------                        ----------------------------
Harry L. Robinson                                   Carl A. Florio
President and CEO                                   President and CEO
Cohoes Bancorp                                      Hudson River Bancorp

                               - VERY IMPORTANT -

      IF you have any questions about HOW to vote "FOR" the Cohoes/Hudson River
'Merger of Equals', please call our proxy solicitor, Regan & Associates, Inc. at
(800) 737-3426.

      As a 'general' rule, our "WHITE" proxy should be returned ONLY in the
prepaid envelope that was supplied to you. IF YOUR SHARES ARE HELD BY A BROKER
OR BANK, it is necessary that your proxy instructions be returned to them FIRST,
so that they can issue a vote on your behalf. YOU MUST RETURN THE
COMPUTER-GENERATED FORM. A VOTE BY TELEPHONE OR THE INTERNET WILL NOT BE VALID.



      This letter may contain forward-looking statements within the meaning of
the Private Securities Litigation Reform Act of 1995 that involve risk and
uncertainty. It should be noted that a variety of factors could cause the
combined company's actual results and experience to differ materially from the
anticipated results or expectations expressed in the combined company's
forward-looking statements

      The risks and uncertainties that may affect the operations, performance,
development, growth projections and results of the combined company's business
include, but are not limited to, the growth of the economy, interest rate
movements, timely development by the combined company of technology enhancements
for its products and operating systems, the impact of competitive products,
services and pricing, customer based requirements, Congressional legislation,
acquisition cost savings and revenue enhancements and similar matters. Readers
are cautioned not to place undue reliance on forward-looking statements which
are subject to influence by the named risk factors and unanticipated future
events. Actual results, accordingly, may differ materially from management
expectations

      Cohoes and Hudson River do not undertake, and specifically disclaim, any
obligation to publicly release the results of any revisions which may be made to
any forward-looking statements to reflect the occurrence of anticipated or
unanticipated events or circumstances after the date of such statements.

      Hudson River has filed a Registration Statement on Form S-4 concerning the
merger with the United States Securities and Exchange Commission which includes
the joint merger proxy statement/prospectus being provided to shareholders. In
addition, Hudson River and Cohoes each intend to file a Solicitation/
Recommendation statement with the United States Securities and Exchange
Commission in response to the Tender Offer Statement to be filed by TrustCo Bank
Corp NY. WE URGE INVESTORS TO READ THESE DOCUMENTS BECAUSE THEY CONTAIN
IMPORTANT INFORMATION. Investors are currently able to obtain the Form S-4
Registration Statement and will be able to obtain the
Solicitation/Recommendation Statement of each company when filed, free of charge
at the SEC's website, www.sec.gov. In addition, documents filed with the SEC by
Cohoes are available free of charge from the Secretary of Cohoes at 75 Remsen
Street, Cohoes, New York 12047, telephone (518) 233-6500. Documents filed with
the SEC by Hudson River are available free of charge from the Secretary of
Hudson River at One Hudson City Centre, Hudson, New York 12534, telephone (518)
828-4600.

      Cohoes and Hudson River and their respective directors and executive
officers may be deemed to be participants in the solicitation of proxies to
approve the Merger. INFORMATION ABOUT THE PARTICIPANTS MAY BE OBTAINED THROUGH
THE SEC'S WEBSITE FROM THE S-4 REGISTRATION STATEMENT AND DOCUMENTS FILED UNDER
RULE 425 FILED WITH THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION ON JUNE
26, 2000, AS AMENDED, AND JULY 20, 2000, RESPECTIVELY.









[Set  forth  below  is a  corrected  table  from  page  17 of  the  Joint  Proxy
Statement/Prospectus  of Hudson River Bancorp,  Inc. and Cohoes  Bancorp,  Inc.,
dated July 3, 2000.  This  information  is being  provided  to correct  printing
errors in the original document.]


The table below sets forth the comparative  data as of and for the twelve months
ended March 31,  2000.  For  Cohoes,  the data below is as of and for the twelve
months ended December 31, 1999.


                                        Hudson
                                        River    Cohoes    Regional    Highly
                                       Bancorp   Bancorp    Group      Valued
                                     ---------- -------- ----------- ----------
Total assets                         $1,149,547 $708,884 $1,090,996  $1,248,561
Annual growth rate of total assets       30.46%   (.05)%      8.02%      10.10%
Tangible equity/assets                   16.45%   18.34%      7.97%       6.01%
Intangible assets/total equity            5.79%    0.00%      1.52%       1.12%
Net loans/total assets                   69.96%   80.00%     65.64%      66.25%
Cash & securities/total assets           23.68%   17.57%     31.02%      30.56%
Gross loans/total deposits              110.06%  119.88%     97.98%      99.99%
Total borrowings/total assets            13.16%   12.50%     21.25%      25.68%
Non-performing assets/total assets        1.04%    0.74%      0.47%       0.48%
Loan loss reserve/gross loans             2.38%    0.78%      1.17%       1.08%
Net interest margin                       4.83%    4.14%      3.27%       3.11%
Loan loss provision/average assets        0.62%    0.28%      0.12%       0.08%
Non-interest income/average assets        0.25%    0.43%      0.36%       0.48%
Non-interest expense/average assets       2.80%    2.55%      2.13%       2.27%
Efficiency ratio                         52.77%   59.36%     59.02%      54.10%
Return on average assets                  0.96%    0.92%      0.97%       1.09%
Return on average equity                  4.58%    4.47%     10.43%      15.69%
Price/tangible book value per share      70.01%   67.66%    117.31%     155.04%
Price/earnings per share                 14.71x   15.97x      9.17x       9.53x
Dividend yield                            1.25%    1.79%      1.52%       3.62%
Dividend payout ratio                    18.46%   26.09%     23.12%      32.25%