Arroyo de la Laguna
Encyclopedia
Arroyo de la Laguna is a 7.5 miles (12.1 km) southward-flowing stream
in Alameda County, California
, USA which originates at the confluences of South San Ramon Creek
and Arroyo Mocho
. The Arroyo de la Laguna is fed by tributaries in the Amador Valley and certain eastern slope drainages of the Diablo Range
; these tributaries include Arroyo del Valle
and Sinbad Creek. Arroyo del la Laguna discharges to Alameda Creek
which in turn flows into the San Francisco Bay
.
From prehistoric times much of the eastern part of the Amador Valley consisted of a lake known as Tulare Lake. With development of the valley starting in the 19th century, drainage alterations in this watershed reduced the lake to a watercourse now called the Arroyo de la Laguna.
underlies Quaternary
valley fill material. Contacts of these two formations are often indistinguishable due to similarities of physical characteristics. The prism of sediments identified as valley fill materials contains from eight to ten separate zones of sand and gravel separated by zones of silt and clay.
Stream
A stream is a body of water with a current, confined within a bed and stream banks. Depending on its locale or certain characteristics, a stream may be referred to as a branch, brook, beck, burn, creek, "crick", gill , kill, lick, rill, river, syke, bayou, rivulet, streamage, wash, run or...
in Alameda County, California
Alameda County, California
Alameda County is a county in the U.S. state of California. It occupies most of the East Bay region of the San Francisco Bay Area. As of the 2010 census it had a population of 1,510,271, making it the 7th most populous county in the state...
, USA which originates at the confluences of South San Ramon Creek
South San Ramon Creek
South San Ramon Creek is a southward-flowing stream in Alameda County and southern Contra Costa County, California, USA. The creek is a tributary to Arroyo de la Laguna and is being actively protected as of 2007 by the city of San Ramon and other entities to preserve riparian zone habitat...
and Arroyo Mocho
Arroyo Mocho
Arroyo Mocho is a stream in eastern Alameda County, California that traverses the cities of Livermore and Pleasanton.The underlying aquifer is the Mocho Subbasin, whose eastern boundary is the Tesla Fault...
. The Arroyo de la Laguna is fed by tributaries in the Amador Valley and certain eastern slope drainages of the Diablo Range
Diablo Range
The Diablo Range is a mountain range in the California Coast Ranges subdivision of the Pacific Coast Ranges. It is located in the eastern San Francisco Bay area south to the Salinas Valley area of northern California, the United States.-Geography:...
; these tributaries include Arroyo del Valle
Arroyo del Valle
Arroyo del Valle or Arroyo Valle is a westward-flowing stream in Alameda County and Santa Clara County, California, USA, that is tributary to Arroyo de la Laguna which in turn flows into Alameda Creek. The stream drains much of the southern portion of the city of Livermore, and it also flows...
and Sinbad Creek. Arroyo del la Laguna discharges to Alameda Creek
Alameda Creek
Alameda Creek is a large perennial stream in the San Francisco Bay Area. The creek runs for from a lake northeast of Packard Ridge to the eastern shore San Francisco Bay by way of Niles Canyon and a flood control channel.-History:...
which in turn flows into the San Francisco Bay
San Francisco Bay
San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...
.
From prehistoric times much of the eastern part of the Amador Valley consisted of a lake known as Tulare Lake. With development of the valley starting in the 19th century, drainage alterations in this watershed reduced the lake to a watercourse now called the Arroyo de la Laguna.
Hydrogeology
In the northern portion of the Arroyo de la Laguna catchment basin, the Tassajara FormationTassajara Formation
The Tassajara Formation is a geologic unit within the Livermore Valley of Northern California, USA. The formation surfaces only in the northern upland parts of the Livermore Valley and underlie the central part of the valley floor at a depth ranging from to...
underlies Quaternary
Quaternary
The Quaternary Period is the most recent of the three periods of the Cenozoic Era in the geologic time scale of the ICS. It follows the Neogene Period, spanning 2.588 ± 0.005 million years ago to the present...
valley fill material. Contacts of these two formations are often indistinguishable due to similarities of physical characteristics. The prism of sediments identified as valley fill materials contains from eight to ten separate zones of sand and gravel separated by zones of silt and clay.
See also
- List of watercourses in the San Francisco Bay Area
- Mocho SubbasinMocho SubbasinThe Mocho Subbasin is the largest of the groundwater 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...
- Pleasanton FaultPleasanton FaultThe Pleasanton Fault is a seismically active geological structure in Alameda County and Contra Costa County, California , USA.-Relation to hydrological features:...
- Tassajara FormationTassajara FormationThe Tassajara Formation is a geologic unit within the Livermore Valley of Northern California, USA. The formation surfaces only in the northern upland parts of the Livermore Valley and underlie the central part of the valley floor at a depth ranging from to...