As of 2005, 287,500 acres (116,300 ha) or 41 percent of the land within, is owned by the state as part of the Forest Preserve; it is managed by the Department of Environmental Conservation (DEC).
2005 gehörten davon 287.514 acre (41 % der Fläche) dem Staat als Teil des Forest Preserve; Der Park wird vom Department of Environmental Conservation (DEC) verwaltet.