EXHIBIT
31.2

Certifications under Section
302 of the Sarbanes-Oxley Act of 2002

I, Mitchell A. Derenzo, certify
that:



|1. | I have reviewed this annual
    report on Form 10-K/A of American River Bankshares;                                                                                                                                                                                                                                                                
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|2. | Based on my knowledge, this report does
    not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,
    in light of the circumstances under which such statements were made, not misleading with respect to the period covered by
    this report;                             
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|3. | Based on my knowledge, the financial statements,
    and other financial information included in this report, fairly present in all material respects the financial condition,
    results of operations and cash flows of the registrant as of, and for, the periods presented in this report;                                                    
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|4. | The registrant’s other certifying officer(s)
    and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
    13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))
    for the registrant and have:

(a) Designed such disclosure
controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within
those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal
control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision,
to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness
of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of
the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report
any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal
quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant’s internal control over financial reporting; and

|5. | The registrant’s other certifying
    officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
    registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent
    functions):
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(a) All significant deficiencies
and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not
material, that involves management or other employees who have a significant role in the registrant’s internal control over financial
reporting.

Date: November 7, 2018

By: /s/ MITCHELL A.
DERENZO

Executive Vice President

and Chief Financial Officer

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