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Arroyo Seco (Alameda County) facts for kids

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Arroyo Seco
Arroyo Seco west of Sandia National Laboratory in Livermore
Arroyo Seco (Alameda County) is located in California
Arroyo Seco (Alameda County)
Location of the mouth in California
Country United States
State California
Region Alameda County
City Livermore
Physical characteristics
Main source spring
8 mi (10 km) southeast of Livermore
1,990 ft (610 m)
37°39′57″N 121°36′51″W / 37.66583°N 121.61417°W / 37.66583; -121.61417
River mouth Arroyo Las Positas
north of Livermore
482 ft (147 m)
37°42′20″N 121°45′23″W / 37.70556°N 121.75639°W / 37.70556; -121.75639

Arroyo Seco is an 11.7-mile-long (18.8 km) watercourse in Alameda County, California, that traverses through the city of Livermore, emptying into Arroyo Las Positas. Arroyo Seco means "dry stream" in Spanish. Arroyo Seco lies above the Arroyo Seco watershed, which includes the eastern part of the city of Livermore and also the Sandia National Laboratory. The Mocho Subbasin is the largest of the subbasins in the Livermore Valley watershed. This subbasin is bounded to the west by the Livermore Fault Zone and to the east by the Tesla Fault. Some groundwater flow occurs across these fault boundaries, but flows are discontinuous below a depth of 50 feet (15 m) across the Tesla Fault and south of the Arroyo Mocho channel across the Livermore Fault. A number of threatened and endangered species reside in this watershed.

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