The New Student's Reference Work/St. Mary's Strait
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St. Ma′ry’s Strait or River connects Lakes Superior and Huron, and forms the boundary between Ontario and the upper peninsula of Michigan. The strait is sixty-three miles long. One mile below Lake Superior are the rapids called the Sault Ste. Marie, below which the river spreads out into a broad lake. These rapids have a fall of 20½ feet, around which a canal was built in 1855, most of it cut through solid rock. In 1895 a canal was opened on the Canadian side.