EXHIBIT 23.1

 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-49196 and 333-167592 on Form S-8 and of American River Bankshares of our report dated February 27, 2018 relating to the financial statements and effectiveness of internal control over financial reporting, appearing in this Annual Report on Form 10-K.

/s/ Crowe Horwath LLP

Sacramento, California

February 27, 2018

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