Rule 2. On the frozen surfaces of South Manistique Lake, section 18, T44N, R11W; and section 13, T44N R12W; Portage Township, Mackinac County, a person shall not operate a snowmobile at a speed greater than that necessary to maintain forward movement of the snowmobile when the snowmobile is being operated within 100 feet of any open water during the period of 1/2-hour after sunset to 1/2-hour before sunrise.
Mich. Admin. Code R. 257.1602