ORS § 384.115
In the acquisition, establishment, construction or operation of a ferry mentioned in ORS 384.105, the Department of Transportation and the county court of any county within which is located any stream, river, bay, arm of the ocean or other body of water over which it is contemplated and found necessary to operate ferries, may enter into a cooperative agreement for the acquisition, construction, operation or maintenance of the ferry upon such terms and conditions as the county court and the department agree. When the ferry is operated under a cooperative agreement between the county court and the department, the cost and expense incident to the acquisition, construction, operation or maintenance of the ferry shall be apportioned between the county and the state in such manner and amount as is agreed upon.
ORS 384.115