Arroyo Seco is an U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data
The National Map
, accessed March 15, 2011

watercourse A stream is a continuous body of surface water flowing within the bed and banks of a channel. Depending on its location or certain characteristics, a stream may be referred to by a variety of local or regional names. Long large streams are ...

Alameda County, California Alameda County ( ) is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. Al ...

, that traverses through the city of Livermore, emptying into

Arroyo Las Positas Arroyo Las Positas is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed March 15, 2011 westward-flowing watercourse in Alameda County, California, which begins at the confluence of Arro ...

. ''Arroyo Seco'' means "dry stream" in

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...

. Arroyo Seco lies above the Arroyo Seco watershed, which includes the eastern part of the city of Livermore and also the

Sandia National Laboratory Sandia National Laboratories (SNL), also known as Sandia, is one of three research and development laboratories of the United States Department of Energy's National Nuclear Security Administration (NNSA). Headquartered in Kirtland Air Force Bas ...

. The

Mocho Subbasin The Mocho Subbasin is the largest of the groundwater subbasins in the Livermore Valley watershed in Northern California. This subbasin is bounded to the west by the Livermore Fault Zone and to the east by the Tesla Fault. Some groundwater fl ...

is the largest of the subbasins in the

Livermore Valley The Livermore Valley, historically known as the Valle de San José (Valley of San José), is a valley in Alameda County, California, located in the East Bay region. The city of Livermore is located in the valley. Geography The valley is bound ...

watershed. This subbasin is bounded to the west by the

Livermore Fault Livermore may refer to: Places in the United States *Livermore, California ** Lawrence Livermore National Laboratory, a U.S. Department of Energy lab in Livermore, California **Livermore Valley AVA, California wine region in Alameda County *Livermo ...

Zone and to the east by the

Tesla Fault The Tesla Fault can be found in the northeastern Diablo Range, California. This fault is only semi-active. Geology This fault has been demonstrated to have a dextral offset of and is closely associated with the Greenville Fault. Mocho Subbas ...

. Some

groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidate ...

flow occurs across these fault boundaries, but flows are discontinuous below a depth of across the Tesla Fault and south of the

Arroyo Mocho Arroyo Mocho is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed March 15, 2011 stream which originates in the far northeastern corner of Santa Clara County and flows northwesterly into ...

channel across the Livermore Fault. A number of

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...

and

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inv ...

reside in this watershed.Lawrence Livermore National Laboratory Environmental Features
/ref>

References

Rivers of Alameda County, California El Camino Viejo Washes of California Tributaries of Alameda Creek {{AlamedaCountyCA-geo-stub

See also

References