Los Alamos Canyon Creek, a stream or arroyo, tributary to San Mateo Creek, in the Cleveland National Forest in Riverside County, California. Its source is at an altitude of 2300 feet, in a canyon on the south face of the ridge of Elsinore Mountains that descends to the southeast from Elsinore Peak. Los Alamos Canyon Creek, (source), USGS Map Name: Wildomar, CA Map Center: N33° 35' 23" W117° 18' 53", from topoquest.com accessed on 5/4/2013 The creek descends southward for a short distance then turns southwest for 4 miles where it turns west for 3 miles down Los Alamos Canyon to its confluence with San Mateo Creek at an elevation of 1312 feet. Los Alamos Canyon Creek, (mouth), USGS Map Name: Sitton Peak, CA, Map Center: N33° 33' 4" W117° 23' 38", from topoquest.com accessed on 5/4/2013 Beatrice Dawson Wood, Gazetteer of Surface Waters of California, Pacific Coast Basins and Great Basin, U.S. Government Printing Office, Washington, 1913, p.121
Los Alamos Canyon Creek has one named tributary Wildhorse Canyon Creek Wildhorse Canyon Creek, USGS Map Name: Wildomar, CA, Map Center: N33° 35' 51" W117° 22' 23" from topoquest.com accessed on 5/4/2013 but has two unnamed arroyos descending from the Elsinore Mountains. Unnamed arroyo from southwestern San Mateo Peak, USGS Map Name: Sitton Peak, CA, Map Center: N33° 33' 3" W117° 23' 36" from topoquest.com accessed on 5/4/2013 Unnamed arroyo from southern Elsinore Mountains west from Esinore Peak, USGS Map Name: Wildomar, CA, Map Center: N33° 33' 25" W117° 20' 24 from topoquest.com accessed on 5/4/2013 and one that drains the western Santa Rosa Plateau and the east slope of the Tenaja Mountain highland and descends to the north to join the creek where it turns to the west.Unnamed arroyo draining east slope of the Squaw Mountain highland and western Santa Rosa Plateau, USGS Map Name: Wildomar, CA, Map Center: N33° 33' 10" W117° 20' 33" from topoquest.com accessed on 5/4/2013
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