Rend Lake was created when the United States Army Corps of Engineers dammed the Big Muddy River.

[1] Archived 2006-07-26 at the Wayback Machine The shoreline of Rend Lake extends 162 miles (261 km), part of which is preserved as Wayne Fitzgerrell State Recreation Area.

Swimming beaches at North Marcum and South Sandusky are managed and maintained by the US Army Corps of Engineers.

In 2010, Rend Lake was designated as an Important Bird Area of Illinois.

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