Rule 4. On the waters of the St. Joseph river, T7S, T8S, R12W, Constantine and Mottville townships, St. Joseph county, in the northeast 1/4 of section 5, T8S, R12W and north of the south line of section 28, T7S, R12W, it is unlawful for the operator of a vessel to exceed a slow-no wake speed at any time.
Mich. Admin. Code R. 281.775.4