Illinois is called the Prairie State, but only remnants of the original prairie remain. Large-scale conversion into agricultural land and urban development has eliminated more than 99% of the state's original prairie. At two sites in northern Illinois, however, INHS is involved in large-scale prairie restorations. Both sites are military installations that are being transferred from the Army to other federal agencies as part of base realignment and closure legislation. In 1997, the U.S. Forest Service (USFS), in cooperation with the Illinois Department of Natural Resources (IDNR), established Midewin National Tallgrass Prairie on 19,000 acres of the Joliet Arsenal in Will county. In the spring of 2000, the Savanna Army Depot, located in Carroll and Jo Daviess counties, will close and the U.S. Fish and Wildlife Service (USFWS) will begin managing approximately 9,500 of its 13,000 acres as the Lost Mound Wildlife Area.