Oregon Revised Statutes Wildlife § 498.152

(1) The State Fish and Wildlife Commission may enter into agreements with the owners or lawful possessors of land to restrict the operation or parking of motor-propelled vehicles on the land when the commission determines that such operation or parking is damaging wildlife or wildlife habitat.

(2) An agreement shall restrict the types and uses of motor-propelled vehicles on the land and shall specify the times and places that such restrictions apply.

(3) The commission shall cause notice of the restrictions, including the effective date thereof, to be posted on the main traveled roads entering the area to which the restrictions apply.

(4) Nothing in this section authorizes the establishment of any restrictions that impede normal forest or range management operations.