Tulare Lake (Alameda County)

Tulare Lake was a large, shallow lake in eastern Amador Valley, surrounded by Willow Marsh (also known as the Lagoon). Tule rushes and willow trees once lined the marshes and sloughs of its shores. Drainage alterations starting in the 19th century have since reduced the marsh to the Arroyo de la Laguna,[2][1] and the city of Pleasanton has since expanded across what was once marshland. Such rapid developments have led to tricky seasonal flow variations in Niles Canyon.[4]

For the historic drained lake in the southern Central Valley, California, see Tulare Lake.
Tulare Lake
  • Willow Marsh
  • The Lagoon
The extent of the marshland surrounding Tulare Lake in 1878
Tulare Lake
LocationAmador Valley
Alameda County, California
Coordinates37°40′N 121°54′W[1]
TypeMarsh (drained)
EtymologyOnce characterized by tule rush
Primary inflowsArroyo Mocho
Arroyo Valle
Arroyo Las Positas
Tassajara Creek
South San Ramon Creek[2]
Primary outflowsAlameda Creek, via Arroyo de la Laguna
Catchment areaSan Francisco Bay
Basin countriesUnited States
SettlementsPleasanton, California
Dublin, California
Pelnen (Ohlone)[3]
Seunen (Ohlone)[3]

The lake was fed by Arroyos Mocho, Valle, and Las Positas (when rainfall was substantial enough for them to reach the lagoon), as well as by Tassajara Creek and other Amador Valley creeks. Its seasonal outlet was the Arroyo de la Laguna.

References
  1. Janet M. Sowers (2003). Creek & Watershed Map of the Pleasanton & Dublin Area (PDF) (Map). Amador Valley: Oakland Museum of California. Retrieved 25 Oct 2020.
  2. "Guide to San Francisco Bay Area Creeks". San Francisco Bay Area Graphic Creek & Watershed Finder. Oakland Museum of California. Retrieved 25 Oct 2020.
  3. "Native Peoples of the Region Now Known as the East Bay" (Map). Native Peoples of the Bay Area (PDF). East Bay Regional Parks District. p. 12. Retrieved 25 Oct 2020.
  4. Okamoto, Ariel Rubissow. "Alameda Work Trickles On". SF Estuary Magazine. San Francisco Estuary Partnership. Retrieved 25 Oct 2020.

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