High Quality Content by WIKIPEDIA articles! William W. Powers State Recreation Area is an Illinois state park administered by the Illinois Department of Natural Resources on 580 acres (2.35 km2) in the Hegewisch community area of the City of Chicago in Cook County, Illinois, United States. The area includes 419 acres (1.70 km2) of water in Wolf Lake that provides about 6 miles (9.7 km) of shoreline to fishermen. The park hosts about half a million visitors annually. The park contains numerous species, and is one of the most important biological sites in the Chicago region.