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St. Clair River, SaintClair, East China Township, Saint Clair County, Michigan, 48054-1596, United States (42.82347 -82.48019)
The river is 40.5 miles (65.2 km) long and drops 5 feet (2 m) in elevation from Lake Huron to Lake St. Clair. The flow rate averages around 182,000 cubic feet per second (5,200 m3/s), and the drainage area is 223,600 square miles (579,000 km2). This takes into account the combined drainage areas of Lakes Huron, Michigan, and Superior.