Los Alamos Canyon Creek

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Coordinates: 33°33′04″N 117°23′38″W / 33.55111°N 117.39389°W / 33.55111; -117.39389
Los Alamos Canyon Creek[1]
Los Alamos Canyon
Stream, Valley, Arroyo
Country USA
State California
Region Riverside County
 - left unnamed arroyo from Squaw Mountain highland & Santa Rosa Plateau
 - right unnamed arroyo from Elsinore Mountains, below Elsinore Peak., Wildhorse Canyon Creek, unnamed arroyo from San Mateo Peak
Source southeastern slope of Elsinore Mountains
 - elevation 2,300 ft (701 m)
 - coordinates 33°35′39″N 117°19′05″W / 33.59417°N 117.31806°W / 33.59417; -117.31806
Mouth confluence with San Mateo Creek
 - elevation 1,312 ft (400 m)
 - coordinates 33°33′04″N 117°23′38″W / 33.55111°N 117.39389°W / 33.55111; -117.39389
Length 7 mi (11 km)
Map of San Mateo Creek and Arroyo San Onofre drainage basins. San Mateo Creek basin is in dark green.

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.[2] The creek descends southward for a short distance then turns southwest for 4 miles were it turns west for 3 miles down Los Alamos Canyon to its confluence with San Mateo Creek at an elevation of 1312 feet.[3][4]

Los Alamos Canyon Creek has one named tributary Wildhorse Canyon Creek[5] but has two unnamed arroyos descending from the Elsinore Mountains.[6][7] and one that drains the western Santa Rosa Plateau and the east slope of the Squaw Mountain highland and descends to the north to join the creek where it turns to the west.[8]