The St. Marys River (sometimes written as the St. Mary’s River) drains from Lake Superior from the end of Whitefish Bay and 74.5 miles southeast into Lake Huron with a fall of 23 feet. For its entire length it is an international border, separating Michigan from Ontario, Canada. It is one of Michigan’s top fishing destinations.
The St. Marys River consists of a number of channels and three large islands–St. Joseph, Neebish and Sugar–as well as three very shallow (at times) lakes–Munuscong, Nicolet and George. It encompasses both U.S. and Canadian territories, which can be confusing, especially when you arrive at the twin towns of Sault Ste. Marie (one in Michigan and one in Ontario).
Plan your boating trip on the St. Marys River, MI/ON, CAN. Browse marinas, dockage, service yards, and navigation alerts.
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The Waterway Guide Team has gained extensive boating knowledge over the years, and now we are sharing all of the tips, skills and tools we’ve picked up along the way!