Donnelley/Depue State Park in Putnam County, Illinois, is a 3,015-acre protected area managed both as an Illinois state park and as a wildlife management area. Formally named the Donnelley/Depue State Fish and Wildlife Area, it serves chiefly for fish and wildlife conservation rather than for built attractions. Its significance lies in its protected landscape and habitat, which make it part of Illinois's broader network of public natural areas.