<P> Rivers, Trails and Conservation Assistance Program The RTCA program of the National Park Service is designed to assist local communities and the public in preservation of rivers, trails and greenways . Unlike the mainline National Park Programs, these programs take place on non-federal property at the request of the local community . One of their better known programs is Rails to Trails, where unused railroad right - of - ways are converted into public hiking and biking trails . </P> <Dl> <Dt> National Trails System </Dt> </Dl> <Dt> National Trails System </Dt> <P> The National Trails System is a joint mission of the National Park Service, the Bureau of Land Management and the U.S. Forest Service . It was created in 1968 to establish a system of long - distance National Scenic and National Historic Trails, as well as to recognize existing trails in the states as National Recreation Trails . Several additional trails have been established since 1968, and in 2009 Congress established the first National Geologic Trail . </P>

Who owns the national parks in the united states