Lake Susan is 88 acres and has a maximum depth of 17 feet. Water clarity is fair and phosphorus is moderate. Invasive species include Common Carp, Curlyleaf Pondweed, and Eurasian Watermilfoil. Black Crappie, Bluegill, Northern Pike, and Black Bullhead are the most abundant common fish species. Lake Susan Park includes a swimming beach, boat ramp, fishing access, playground, and trails and picnic areas. Lake Susan Preserve is 59 acres and all natural wooded and wetland areas with walking trails.