Saint Clair River

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Map of the St. Clair River c. 1900 from the 10th edition of Encyclopædia Britannica.

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Saint Clair River

river, North America

Written and fact-checked by The Editors of Encyclopaedia Britannica

Last Updated: Dec 7, 2024 • Article History

News •

Imperial Oil reports biomass spill into St. Clair River in Ontario • Dec. 3, 2024, 10:34 PM ET (Reuters)

Saint Clair River, outlet for Lake Huron, forming part of the boundary between Michigan, U.S. (west), and Ontario, Can. (east). Flowing southward into Lake Saint Clair, with a fall of 5.7 feet (1.7 m) in 39 miles (63 km), the river discharges through a silty, seven-mouth delta, with the South Channel (27-foot [8-metre] minimum depth) used for deep-drafted vessels. The St. Clair delta is the world’s largest delta that enters a freshwater lake. The islands in the delta form popular summer resorts, the largest being Harsens Island, Mich., and Walpole, Ont. The river is an important link in the St. Lawrence Seaway, and the main ports are Port Huron, Mich., and Sarnia-Clearwater, Ont.

This article was most recently revised and updated by Lorraine Murray.