Crab Orchard Lake is a 6,965-acre (28.2 km²) reservoir in Williamson County, Illinois. It is the centerpiece of the Crab Orchard National Wildlife Refuge. It is fed by Devils Kitchen Lake and Little Grassy Lake, which are also within the National Wildlife Refuge.Crab Orchard Lake was created when Crab Orchard Creek, a tributary of the Big Muddy River in southern Illinois, was dammed in the 1930s for purposes of recreation and flood control.
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