Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 543.730

(1) Failure of any claimant for a period of five successive years ending after August 20, 1957, to file the written statement showing the extent of the claim as required by ORS 543.720, or failure of any claimant for a period of five successive years ending after August 20, 1957, to pay the annual license fee as required by ORS 543.710, shall be conclusive evidence of the abandonment by the claimant of the claim and of all right to water for power purposes in connection with such claim.

(2) When a claim is abandoned under the provisions of subsection (1) of this section, or whenever a claimant has voluntarily authorized, in writing, the cancellation of a claim or the water right in connection therewith, the Water Resources Commission shall: