EXHIBIT 23.1 CONSENT OF ARTHUR ANDERSEN LLP AS INDEPENDENT PUBLIC ACCOUNTANTS 7 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANT As independent public accountants, we hereby consent to the incorporation by reference in this Form S-8 registration statement of our report dated February 25, 2000 included in North Bay Bancorp's Form 10-K for the year ended December 31, 1999 and to all references to our Firm included in this Form S-8 registration statement. /s/ Arthur Andersen LLP San Francisco, California August 11, 2000 8