 As of mid-2004, the department managed 507 million acres (2,050,000 km²) of surface land, or about one-fifth of the land in the United States.It manages 476 dams and 348 reservoirs through the Bureau of Reclamation, 410 national parks, monuments, seashore sites, etc.through the National Park Service, and 544 national wildlife refuges through the Fish and Wildlife Service.