Oregon Revised Statutes Revenue and Taxation § 308A.374

(1) The assessor shall at all times be authorized to demand in writing, by first class mail, and to receive reports from owners of land designated as riparian under ORS 308A.350 to 308A.383 as to the use of the land. If the owner fails to comply within 90 days after receipt of the demand, the assessor shall give written notice to the State Department of Fish and Wildlife and to the landowner of the assessor's intention to withdraw the land from designation and apply the payments and penalties provided in ORS 308A.368 not less than 30 days prior to automatic withdrawal of the riparian land from designation. If, prior to the expiration of the 30-day period, the landowner fails to file the requested report, the assessor immediately shall withdraw the land from designation and apply the payments and penalties provided in ORS 308A.368.

(2) If the assessor has reason to believe that land designated as riparian land no longer qualifies for designation and special assessment, the assessor shall request the State Department of Fish and Wildlife to determine if the land continues to qualify. The request shall be in writing. Upon receipt of the request, the State Department of Fish and Wildlife shall inspect the property and may take whatever steps are necessary to determine if the land continues to qualify for special assessment. The State Department of Fish and Wildlife shall notify the assessor of the determination made pursuant to the request of the assessor within 120 days after the request is received. A determination by the State Department of Fish and Wildlife that the property no longer qualifies shall constitute a discovery described in ORS 308A.368 (2).