Mich. Comp. Laws § 120.111

Sec. 11. Except with respect to docks or wharves owned, controlled, or operated by, the authority, this act shall not be construed to impose a duty upon an authority to a person using its waters in regard to the safety thereof, or to render an authority liable for loss of life or injury or damage to person or property, by reason of an obstruction in, or unsafe condition of, any part of its waters, nor shall this act be construed to render the authority liable in damages or otherwise for an omission to pass or enforce a rule or resolution made under this act.