St. Clair River
| Saint Clair River | |
|---|---|
Sentinel-2 satellite photo, showing Lake Saint Clair (center), as well as St. Clair River connecting it to Lake Huron (to the North) and Detroit River connecting it to Lake Erie (to the South) | |
| Location | |
| Countries | Canada, United States |
| Physical characteristics | |
| Source | |
| • location | Lake Huron |
| Mouth | |
• location | Lake St. Clair |
| Length | 40.5 mi (65.2 km) |
| Basin size | 223,600 mi2 (579,000 km2) |
| Discharge | |
| • average | 182,000 cu ft/s (5,200 m3/s) |
The St. Clair River is a 40.5-mile-long (65.2 km) river in eastern North America that flows from Lake Huron into Lake St. Clair, forming part of the international boundary between Canada and the United States and between the Canadian province of Ontario and the U.S. state of Michigan. The river is a significant component in the Great Lakes Waterway, whose shipping channels permit cargo vessels to travel between the upper and lower Great Lakes. The St. Clair Delta is located at the mouth of the St. Clair River where it meets Lake St. Clair and is the largest delta in the Great Lakes system, covering approximately 140 square miles (360 km2).