Mich. Comp. Laws § 255.2: Board of supervisors; ferries; rates, hours of service, regulations.

Sec. 2.

The said board when they shall grant any license to keep a ferry, shall order and direct the rates of ferriage which the person licensed may receive, and may from time to time thereafter, during the continuance of such license, alter such rates; and they may also direct what and how many hours each day such person shall attend his ferry.