Big River State Forest is a conservation area on 2,900 acres in Henderson County, Illinois, United States. The land was first acquired in 1925 as only a 200-acre refuge, but subsequent land purchases raised the total to 2,900 acres.
Location: Henderson County, Illinois, USA
Established: 1925
Nearest city: Keithsburg, Illinois
Area: 2,900 acres (1,174 ha)
Governing body: Illinois Department of Natural Resources