Mich. Comp. Laws § 485.120

Sec. 20. If any person shall wilfully obstruct any stream or waters improved under the provisions of this act, or any part thereof, or shall wilfully destroy or injure any buildings, piers, dams, fixtures, banks or other constructions in use upon the same belonging to said company, such person or persons so offending shall, for every offense, be deemed guilty of a misdemeanor, and shall be punished by a fine not exceeding 500 dollars, or by imprisonment in the county jail not more than 1 year, in the discretion of the court.