Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 368.126

When a county governing body establishes a new public road following the general alignment of an existing public road, the final order or resolution shall identify all parts of any existing road that are to be vacated. Vacation of those parts described is effective without any other proceedings. A road so vacated shall not be closed to public use until the road laid out to replace it is actually opened to travel.