Mich. Comp. Laws § 255.51: Board of supervisors authorized to acquire ferry service.

Sec. 1.

The boards of supervisors of the several counties of this state are hereby authorized, by a 2/3 vote of the members elect thereof, to acquire ferry services, and the necessary equipment therefor, as part of the highway system of said counties.

The board of supervisors of any county acquiring such ferry service may from time to time make appropriations for the purchase, operation and/or maintenance of said ferry and ferry services.