Devil's Kitchen Lake is an 810-acre (3.3 km²) reservoir in southern Illinois, created by the damming of Grassy Creek, a tributary of Crab Orchard Lake and the Big Muddy River. Most of the lake is located in Williamson County, southwest of Marion, Illinois. The lake is accessible from Interstate 57. Two arms of the lake penetrate into adjacent Union County. The lake is managed by the U.S.