Flat Lake   Be the first to submit input for Flat Lake. If you have info on Flat Lake, Calhoun County, Illinois please submit it here to improve this web site.          These outdoors activities are available near Flat Lake.   Lakes Near Flat Lake: Clear Lake, Lincoln County, 11 miles away   Public Lands Near Flat Lake: Castlewood State Park, Missouri, 21 miles away Route 66 State Park, Missouri, 23 miles away Cuivre River State Park, Missouri, 29 miles away   Marinas On or Near Flat Lake: Winneberg Marina, Golden Eagle, 2 miles away Allan Joseph Marine, Golden Eagle, 2 miles away Eagles Landing Marina, Saint Charles, 3 miles away Lake Center Marina, Saint Charles, 3 miles away Gibson Marina, Saint Charles, 4 miles away   Camp Grounds Near Flat Lake: Sundermeier Rv & Boat Storage, St Charles, 9 miles away   Hotels Near Flat Lake: Sleep Inn Saint Charles, Saint Charles, 7 miles away Holiday Inn Express Hotel & Suites ST CHARLES, Saint Charles, 7 miles away Hampton Inn St LouisSt Charles, Saint Charles, 9 miles away Super 8 St Charles, Saint Charles, 9 miles away Country Inn & Suites By Carlson, St, Peters, MO, Saint Peters, 9 miles away   Ski Areas Near Flat Lake: Hidden Valley, Missouri, 24 miles away       250 foot drop, 6 lifts, 9 runs   Whitewater Near Flat Lake: Whitewater Outfitter - Raging Rivers Water Park, JerseyCounty, 9 miles away       Whitewater outfitter