The Emerald Horseshoe is an envisioned trail system in the San Gabriel Valley for walkers, joggers, hikers, bicyclists and equestrians that would link people to open space areas in their own backyards.
The 25-mile corridor would begin at the Los Angeles River in East Los Angeles and head north through the Arroyo Seco to the foothills of the San Gabriel Mountains, continuing along the foothills before descending through the Eaton Wash to the Rio Hondo River.
The system would provide access to parks and wilderness areas for people living in neighborhoods with few natural areas, and would serve as a possible route to work and school. It would also connect to a network of parks and greenways known as the Emerald Necklace, a 17-mile loop connecting 10 cities along the Rio Hondo and San Gabriel Rivers.
The Emerald Horseshoe was conceived by the Pasadena group Open Space Now. It was the subject of a comprehensive 2008 study commissioned by AFC and conducted by landscape architects who later formed Mark.Thomsen.Thompson Planning Group. The study was funded by grants from the Santa Monica Mountains Conservancy and the Rivers and Mountains Conservancy.