Mich. Comp. Laws § 97.3

Sec. 3. The council shall have authority to prohibit the encumbering of the public wharves and landings, and to regulate the use of all wharves, docks, and landing places within the city; regulate the use and location of wharf boats; and to regulate and prescribe the rates and charges for landing, wharfage, and dockage at all public and private wharves, docks and landings, and to collect wharfage and dockage from boats, water craft, and floats landing at or using any public landing place, wharf, or dock within the city.