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Lake Superior 

Black River, MI Big Bay, MI

Lake Superior is the largest of the 5 Great Lakes fed by diversions through Long Lake in Long Lac, Ontario and Lake Nipigon in Ogoki, Ontario. An average of 5.300 cubic feet of water per second enters her Northern shoreline through these 2 diversions. Both diversions have been in operation since the early 1940's with water coming from the Hudson Bay watershed. The outflow of this water is controlled by a 16 gate control structure, 5 navigation locks, 3 hydropower plants and the St. Mary's Rapids in Sault Ste. Marie, Ontario and Michigan. Lake Superior has an average outflow of 76,000 cubic feet per second.

Elevation: 601 ft. above sea level         Maximum Depth: 1330 feet

Length: 350 miles          Max. Width: 160 miles          Volume: 2,935 cubic miles

National Oceanic and Atmospheric Administration

Chart# 14961

 

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