Arroyo Seco (Los Angeles County)

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 as this canyon had the least water of any he had seen. During this exploration he met the Chief Hahamog-na (Hahamonga) of the Tongva Indians.

This article is about the creek in Los Angeles County, California. For the creek in Sonoma County, California, see Arroyo Seco (Sonoma County). For the junior high school in Santa Clarita, see William S. Hart Union High School District § Junior high schools.
Arroyo Seco
The Devil's Gate at the Arroyo Seco River prior to 1920 damming. Note the "devil's profile" in the rock to the right.
Location of the mouth of Arroyo Seco in California
Location
CountryUnited States
StateCalifornia
Physical characteristics
SourceSan Gabriel Mountains
 • locationnear Red Box Gap, Angeles National Forest
 • coordinates34°16′10″N 118°06′19″W
 • elevation5,200 ft (1,600 m)
MouthLos Angeles River
 • location
Glendale Narrows, near Lincoln Heights, United States of America
 • coordinates
34°04′44″N 118°13′33″W
 • elevation
302 ft (92 m)
Length24.9 mi (40.1 km)
Basin size46.7 sq mi (121 km2)
Discharge 
 • locationnear Pasadena
 • average10.1 cu ft/s (0.29 m3/s)
 • minimum0 cu ft/s (0 m3/s)
 • maximum8,620 cu ft/s (244 m3/s)
Basin features
Tributaries 
 • leftBear Creek, Los Angeles, Millard Creek, Los Angeles
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