(LETTERHEAD OF DOHERTY, WALLACE, PILLSBURY AND MURPHY, P.C.)

EXHIBIT 5

July 22, 2002

Westbank Corporation
225 Park Avenue
West Springfield, MA  01089

RE:   Registration Statement on Form S-8

Ladies and Gentlemen:

      In connection with the registration on Form S-8 under the Securities Act
of 1993, as amended (the "Securities Act"), of 54,885 shares (the "Shares') of
common stock, par value $2.00 per share, of Westbank Corporation (the "Company")
reserved for issuance pursuant to the Cargill Bank of Connecticut Stock Option
Plan, as amended and adopted by the Company (the "Plan"), we have examined such
corporate documents and records of the Company, such other instruments and
certificates of public officials, officers and representatives of the Company
and other persons and such questions of law as we have deemed necessary or
appropriate in order to render the opinion set forth herein.

      In such examination, we have assumed the genuineness of all signatures,
the authenticity of all documents submitted to us as originals, the conformity
to original documents of all documents submitted to us as copies and the
authenticity of the originals of such copies.

      Based upon and subject to the foregoing, we are of the opinion that when
the registration statement on Form S-8 relating to the Shares (the "Registration
Statement") shall have become effective under the Securities Act and any Shares
shall have been duly issued and paid for in accordance with the terms of the
Plan, such Shares will be legally issued, fully paid and nonassessable.

      The foregoing opinion is limited to the Federal Laws of the United States
and the General Laws of the Commonwealth of Massachusetts. We are expressing no
opinion as to the effect of the laws of any other jurisdiction.

      We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and any amendments thereto. In giving such consent, we do
not hereby admit that we are in the category of persons whose consent is
required under Section 7 of the Securities Act.

Very truly yours,



/s/Doherty, Wallace, Pillsbury and Murphy, P.C.


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