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St. Clair Flats

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description St. Clair Flats Overview

The St. Clair Flats form a broad freshwater delta where the St. Clair River divides into distributary channels before entering Lake St. Clair between Michigan and Ontario.

The delta contains islands, marshes, shallow bays, channels, and extensive beds of aquatic vegetation. Its wetlands provide habitat for fish, waterfowl, and other aquatic species while also supporting navigation, recreation, cottages, and shoreline communities.

help St. Clair Flats FAQ

Is the St. Clair Flats the world's largest freshwater delta?

It is widely described as the largest freshwater delta in North America and is often presented as the world's largest freshwater delta. It formed where the St. Clair River divides into distributaries before entering Lake St. Clair.

Why does the St. Clair River split into so many channels?

Sediment deposited as the river enters slower-moving Lake St. Clair created islands, shoals, and distributary channels. Major branches include the North Channel, Middle Channel, and South Channel.

Which country controls the islands of the St. Clair Flats?

The delta spans the international boundary between Michigan in the United States and Ontario in Canada. Harsens Island is on the Michigan side, while Walpole Island lies on the Ontario side.

What wildlife uses the St. Clair Flats marshes?

The delta's shallow bays, marshes, and aquatic vegetation support fish, waterfowl, marsh birds, turtles, and muskrats. Its location between Lake Huron and Lake St. Clair also makes it an important migration corridor.

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