Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 384.445

(1) The County Court of Umatilla County, Oregon, and the Department of Transportation, in cooperation, may enter into such agreement, as in their judgment is advisable, with the County Court of Benton County, Washington, and the Director of Highways of the State of Washington, for the establishment, maintenance and operation of a public ferry across the Columbia River between Umatilla, Oregon, and Plymouth, Washington, and for connecting the ferry with and making it a part of the state highway systems of Oregon and Washington.

(2) The County Court of Umatilla County, Oregon, and the Department of Transportation may use such portions of the county and state road funds as in their discretion they deem advisable for such purpose.

(3) Such public ferry and county road connecting it with the state highway hereby are made a part of the Oregon state highway system.