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Tulare Lake (Alameda County) facts for kids

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For the historic drained lake in the southern Central Valley, California, see Tulare Lake.
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Tulare Lake
  • Willow Marsh
  • The Lagoon
Lake Tulare crop from Alameda County Map, 1878, Thompson and West.png
The extent of the marshland surrounding Tulare Lake in 1878
Location Amador Valley
Alameda County, California
Type Marsh (drained)
Etymology Once characterized by tule rush
Primary inflows Arroyo Mocho
Arroyo Valle
Arroyo Las Positas
Tassajara Creek
South San Ramon Creek
Primary outflows Alameda Creek, via Arroyo de la Laguna
Catchment area San Francisco Bay
Basin countries United States
Settlements Pleasanton, California
Dublin, California
Pelnen (Ohlone)
Seunen (Ohlone)

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, 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.

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.

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