Black River (St. Clair County)

Black River
The Black River in Port Huron
A map of the Black River and its watershed
Country	United States
State	Michigan
Counties	Sanilac, St. Clair
Physical characteristics
Main source	northern Sanilac County 43°41′00″N 82°48′55″W / 43.68333°N 82.81528°W / 43.68333; -82.81528
River mouth	St. Clair River, Port Huron 574 ft (175 m) 42°58′19″N 82°25′06″W / 42.97194°N 82.41833°W / 42.97194; -82.41833Coordinates: 42°58′19″N 82°25′06″W / 42.97194°N 82.41833°W / 42.97194; -82.41833
Length	81 miles (130 km)
Basin features
Basin size	711 sq mi (1,840 km2)

Black River is an 81.0-mile-long (130.4 km) river in the U.S. state of Michigan, flowing into the St. Clair River in the city of Port Huron. The Black River Canal in northern Port Huron extends east into Lake Huron near Krafft Road.

The river rises in northern Sanilac County, near the boundary with Huron County, and its 711-square-mile (1,840 km²) drainage basin covers most of the central and southern portions of Sanilac County, most of northern St. Clair County, and portions of east central Lapeer County. Large sections of the upper portion of the river and much of its drainage basin are heavily channelized for agricultural irrigation. Black River was the original name of the city of Croswell at the time of its founding in 1845.