Most of the sites managed by the National Park Service are free to visit, but some require an entrance pass. Passes cover entrance fees at lands managed by the National Park Service and U.S. Fish & Wildlife Service. They are also used for day use fees at lands managed by the U.S. Forest Service, Bureau of Land Management, Bureau of Reclamation, and U.S. Army Corps of Engineers. Free Interagency Passes are available for 4th graders, senior citizens, U.S. military families, and individuals with permanent disabilities. Find program details and park locations online.
nps.gov/planyourvisit/passes.htm