Arroyo Seco

The Arroyo Seco, meaning "dry stream" in Spanish, is a 24.9-mile-long (40.1 km) seasonal river, canyon, watershed, and cultural area in Los Angeles County, California. The area was explored by Gaspar de Portolà, who named the stream Arroyo Seco because its canyon had the least water of any he had seen. During this exploration, he met Chief Hahamog-na (Hahamongna) of the Tongva Indians. The watershed begins at Red Box Saddle in the Angeles National Forest near Mount Wilson in the San Gabriel Mountains. As it enters the urbanized area of the watershed, the Arroyo Seco stream flows between La Cañada Flintridge on the west and Altadena on the east. Just below Devil's Gate Dam, the stream passes underneath the Foothill Freeway. At the north end of Brookside Golf Course, the stream has been constrained into a flood control channel and proceeds southward through the golf course. For a very short stretch below the golf course, however, the streambed remains natural. Arroyo Seco goes through Pasadena alongside the San Rafael Hills to its west, where it passes the Rose Bowl Stadium as it goes through Brookside Park. The Arroyo Seco stream, which is fed by a watershed of 46.7 square miles (121.0 km2), helps to replenish the Raymond Basin, an aquifer underlying Pasadena that provides about half of the local water supply. This arroyo is one of two major streams that capture rainfall and storm water in Pasadena, the other being Eaton Wash on the eastern side of the city, which is a tributary of the Rio Hondo watershed. The Arroyo Seco passes under the Ventura Freeway and the Colorado Street Bridge. It crosses the Raymond Fault at the southern boundary of Pasadena, and begins crossing through the Repetto Hills. The channel continues along the western boundary of South Pasadena, then runs into northeast Los Angeles and flows southeast of Mount Washington. The Arroyo Seco then proceeds through the Los Angeles neighborhoods of Highland Park, Hermon, Montecito Heights, and Cypress Park. It ends at the confluence with the Los Angeles River near Elysian Park, north of Dodger Stadium and Downtown Los Angeles. The Arroyo Seco Parkway, or Pasadena Freeway, runs parallel to the channe

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