[Letterhead of Gray Plant Mooty Mooty & Bennett, P.A.]

                                                                     Exhibit 5.1


                                 July 10, 2001

Webb Interactive Services, Inc.
1899 Wynkoop
Suite 600
Denver, CO 80202

          RE:  Form S-3 Registration Statement

Ladies and Gentlemen:

          This opinion is furnished in connection with the registration,
pursuant to the Securities Act of 1933, as amended, of a maximum of 3,091,911
shares of common stock, no par value (the "Shares"), of Webb Interactive
Services, Inc. ("Webb"), including 377,708 shares (the "Shares") currently
outstanding and up to 2,714,203 shares issuable upon the conversion of Webb's
10% Convertible Promissory Note and similar notes issued in payment of interest
on the note, Series B-2 Convertible Preferred Stock and Series C-1 Convertible
Preferred Stock and the exercise of Webb's stock purchase warrants issued in
connection with Webb's Series B Convertible Preferred Stock, 10% Promissory
Notes and Series C-1 Convertible Preferred Stock (the Promissory Notes,
Preferred Stock and Warrants being referred to herein as the "Derivative
Securities" and the common stock subject to the Derivative Securities being
referred to herein as the "Derivative Shares").

          We have acted as counsel to Webb in connection with the preparation of
the Form S-3 Registration Statement (the "Registration Statement"). We have
examined the Articles of Incorporation, as amended, the Bylaws of the Company,
such records of proceedings of Webb as we deemed material and such other
certificates, records and documents as we considered necessary for the purposes
of this opinion.

          Based on the foregoing, we are of the opinion that the Shares and the
Derivative Shares when issued in accordance with the terms of the Derivative
Securities will be legally issued, fully paid and non-assessable securities of
Webb. We understand that this opinion is to be issued in connection with the
Registration Statement. We consent to a filing of a copy of this opinion with
the Registration Statement. We also consent to the reference to us under the
heading "Legal Matters" in the Registration Statement.

                                 Very truly yours,

                                 GRAY, PLANT, MOOTY,
                                 MOOTY & BENNETT, P.A.

                                 /s/  Gray, Plant, Mooty, Mooty & Bennett, P.A.