[COHOES BANCORP, INC. LOGO]                    [HUDSON RIVER BANCORP, INC. LOGO]

Dear Shareholders, Customers, Future Customers and Friends:

     Cohoes  Bancorp and Hudson  River  Bancorp are  strongly  committed  to our
     merger of equals.

     We are concerned that our  shareholders and the public are being misled and
     deceived.

     We can't possibly address everything in one communication,  so let's get to
     the heart of the matter.

MYTH                                    REALITY
- --------------------------------------- ----------------------------------------
1. TrustCo wants to buy our banks.      1. We believe TrustCo wants to
                                           sabotage our merger in order to
                                           prevent increased competition in
                                           this community.
- --------------------------------------- ----------------------------------------
2. Our banks are for sale.              2. We are not selling our banks
                                           separately, especially not at the
                                           inadequate prices suggested by
                                           TrustCo. It is our belief that our
                                           combined franchise is worth far
                                           more together than either of us is
                                           worth independently.
- --------------------------------------- ----------------------------------------
3. Our shareholders would financially   3. TrustCo stock has been declining or
   benefit from TrustCo's takeover.        stagnant for over 18 months. It was
                                           valued at $15.00/share as of
                                           December 31, 1998. It was valued at
                                           $11.94/share on July 11, 2000. We
                                           believe that the TrustCo stock is
                                           still over-valued, and that there
                                           are several conditions to TrustCo's
                                           offers which will not be satisfied.
- --------------------------------------- ----------------------------------------
4. Competition would be enhanced by a   4. A TrustCo takeover would stifle
   TrustCo takeover of our banks.          competition among community banks
                                           in the Capital Region and allow
                                           TrustCo to charge higher fees.

TrustCo has not successfully acquired another bank in the Capital Region in more
than nine years, the hottest period of bank merger activity in recent memory.
Four years ago they failed to complete a takeover of another bank. HERE THEY GO
AGAIN.

We urge everyone to become as informed as possible about the facts. Please call
us if you would like more information.

Yours truly,

/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
(518) 233-6565                          (518) 828-4600

   This letter may  contain  forward-        Hudson    River    has   filed   a
looking statements within the meaning     Registration  Statement  on Form  S-4
of the Private Securities  Litigation     concerning the merger with the United
Reform Act of 1995 that  involve risk     States    Securities   and   Exchange
and  uncertainty.  It should be noted     Commission  which  includes the joint
that a variety of factors could cause     merger   proxy   statement/prospectus
the combined company's actual results     being  provided to  shareholders.  In
and  experience to differ  materially     addition,  Hudson  River  and  Cohoes
from  the   anticipated   results  or     each  intend to file a  Solicitation/
expectations    expressed    in   the     Recommendation   statement  with  the
combined  company's   forward-looking     United States Securities and Exchange
statements.                               Commission  in response to the Tender
                                          Offer   Statement   to  be  filed  by
   The risks and  uncertainties  that     TrustCo   Bank   Corp  NY.   WE  URGE
may    affect     the     operations,     INVESTORS  TO  READ  THESE  DOCUMENTS
performance,    development,   growth     BECAUSE   THEY   CONTAIN    IMPORTANT
projections   and   results   of  the     INFORMATION.  Investors are currently
combined  company's business include,     able   to   obtain   the   Form   S-4
but are not limited to, the growth of     Registration  Statement  and  will be
the economy, interest rate movements,     able  to  obtain  the   Solicitation/
timely  development  by the  combined     Recommendation   Statement   of  each
company  of  technology  enhancements     company when filed, free of charge at
for  its   products   and   operating     the SEC's  website,  www.sec.gov.  In
systems,  the  impact of  competitive     addition,  documents  filed  with the
products,   services   and   pricing,     SEC by Cohoes are  available  free of
customer     based      requirements,     charge from the  Secretary  of Cohoes
Congressional            legislation,     at  75  Remsen  Street,  Cohoes,  New
acquisition  cost savings and revenue     York     12047,    telephone    (518)
enhancements   and  similar  matters.     233-6500.  Documents  filed  with the
Readers  are  cautioned  not to place     SEC by  Hudson  River  are  available
undue  reliance  on   forward-looking     free of charge from the  Secretary of
statements   which  are   subject  to     Hudson   River  at  One  Hudson  City
influence  by the named risk  factors     Centre,   Hudson,   New  York  12534,
and   unanticipated   future  events.     telephone (518) 828-4600.
Actual  results,   accordingly,   may
differ   materially  from  management        Cohoes and Hudson  River and their
expectations.                             respective  directors  and  executive
                                          officers   may   be   deemed   to  be
   Cohoes  and  Hudson  River  do not     participants  in the  solicitation of
undertake, and specifically disclaim,     proxies   to  approve   the   Merger.
any  obligation  to publicly  release     INFORMATION  ABOUT  THE  PARTICIPANTS
the  results of any  revisions  which     MAY BE  OBTAINED  THROUGH  THE  SEC'S
may be  made  to any  forward-looking     WEBSITE  FROM  THE  S-4  REGISTRATION
statements to reflect the  occurrence     STATEMENT   FILED   WITH  THE  UNITED
of   anticipated   or   unanticipated     STATES    SECURITIES   AND   EXCHANGE
events  or  circumstances  after  the     COMMISSION   ON  JUNE  26,  2000,  as
date of such statements.                  amended.