Since 1974, Denver and the surrounding jurisdictions have rehabilitated the urban South Platte River and its tributaries for recreational use by hikers and cyclists. The main stem of the South Platte River Greenway runs along the South Platte from Chatfield Reservoir 35 miles (56 km) into Adams County in the north. The Greenway project is recognized as one of the best urban reclamation projects in the U.S., winning, for example, the Silver Medal Rudy Bruner Award for Urban Excellence in 2001.
State Highway 470 (C-470, SH 470) is the southwestern portion of the Denver metro area's beltway. Originally planned as Interstate 470 in the 1960s, the beltway project was attacked on environmental impact grounds and the interstate beltway was never built. The portion of "Interstate 470" built as a state highway is the present-day SH 470, which is a freeway for its entire length.