Oregon Revised Statutes Revenue and Taxation § 308A.365

(1) When land has once been designated as riparian under ORS 308A.350 to 308A.383, it shall remain under that designation and it shall not be applied to any use other than those specifically included in the management plan or consistent with the intent of ORS 308A.350 to 308A.383 unless withdrawn from designation as provided in subsection (2) of this section.

(2) During any year after designation, notice of request for withdrawal may be given by the owner to the county assessor or assessors of the county or counties in which the land is situated. The county assessor or assessors, as the case may be, shall withdraw such land from designation as riparian and shall immediately give written notice of the withdrawal to the State Department of Fish and Wildlife.