Arroyo de la Laguna
Arroyo de la Laguna is a stream in Alameda County, California and Contra Costa County, California, USA. 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, South San Ramon Creek and Mocho Arroyo. Arroyo del la Laguna discharges to Alameda Creek which in turn flows into the San Francisco Bay.
In 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 1800s, drainage alterations in this watershed reduced the lake to a watercourse now called the Arroyo de la Laguna[1]
Hydrogeology
In the northern portion of the Arroyo de la Laguna catchment basin, the Tassajara Formation underlies Quaternary valley fill material.[2] 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 Subbasin
- Pleasanton Fault
- Tassajara Formation
References
- ^ Arroyo de la Laguna: Watershed Map and Profile)
- ^ C.Michael Hogan and Marc Papineau, Phase I Environmental Site Assessment, Vicinity of Deerwood Drive and Bollinger Canyon Road, San Ramon, Calironia, Earth Metrics Inc.File ref 7815, San Mateo, Ca. (1989)
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