Lake Lou Yaeger is a 1,300-acre (5.2 km²) reservoir located in Montgomery County, Illinois. Created by damming the West Fork of Illinois's Shoal Creek, it was built for recreation, sport fishing, and flood control purposes. The lake is 8 miles (13 km) long and 0.5 miles (0.8 km) wide. The nearest town is Litchfield, Illinois, south of Springfield, Illinois and north of St. Louis, Missouri.Lake Lou Yaeger is managed for bass, bluegill, catfish, and crappie.