Rule 4. On the waters of the Black river, commencing at a point 600 feet southeast of the interstate highway 94 bridge to a point 800 feet northwest of the bridge, city of Port Huron, county of St. Clair, state of Michigan, no operator of any motorboat shall exceed a slow-no wake speed, which means a very slow speed whereby the wake or wash created by the motorboat would be minimal.
Mich. Admin. Code R. 281.774.4