Lake Calumet

Lake Calumet is the largest body of water within the city of Chicago. Formerly a shallow, postglacial lake draining into Lake Michigan, it was transformed into an industrial harbor during the 20th century. Parts of the lake have been dredged, and other parts reshaped by landfill. Following the completion of the Cal-Sag Channel in 1922, which reversed the flow of the Calumet River, the lake drains into the Des Plaines River via the channel instead of Lake Michigan.

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