Little Grassy Lake Campground & Marina sits on Little Grassy Lake, located inside Crab Orchard National Wildlife Refuge. It offers boating and fishing opportunities for bass, crappie, catfish, and bluegill. Where 1,000 acres of crystal clear water , 4 miles long, 1 mile wide, up to 80 feet deep and 31 miles of wooded rocky shoreline create the most scenic lake in southern Illinois.