46 CFR §45.193
The towing vessel must meet the following requirements:
- (a)General. The towing vessel must have adequate horsepower (HP) to handle the tow, but not less than the amount specified for the routes below.
- (b)Milwaukee and St. Joseph routes: a minimum of 1,000 HP.
- (c)Muskegon route: a minimum of 1,500 HP.