46 C.F.R. § 45.185 Tow limitations.
Title 46 - Shipping
(a) Barges must not be manned. (b) No more than three barges per tow on the Milwaukee, St. Joseph, and Muskegon routes. (c) Barges must not be more than 5 nautical miles from shore.
Title 46: Shipping
PART 45—GREAT LAKES LOAD LINES
Subpart E—Unmanned River Barges on Lake Michigan Routes
§ 45.185 Tow limitations.