Amador Valley is a valley in eastern

Alameda County, California Alameda County ( ) is a List of counties in California, county located in the U.S. state of California. As of the 2020 United States census, 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and List ...

and is the location of the cities of

Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...

and Pleasanton. Part of Tri-Valley, the valley is bounded by the foothills of the

Diablo Range The Diablo Range is a mountain range in the California Coast Ranges subdivision of the Pacific Coast Ranges in northern California, United States. It stretches from the eastern San Francisco Bay Area at its northern end to the Salinas Valley a ...

on the north and south,

Pleasanton Ridge Pleasanton Ridge Regional Park is a park in the East Bay Regional Park District overlooking Pleasanton, California and the Livermore Valley to the east. History Pleasanton Ridge Regional Park, located west of the I-680 freeway and the City of ...

to the west, and Livermore Valley to the east. Watercourses draining into the Amador Valley include South San Ramon Creek, Tassajara Creek, Arroyo Mocho, Arroyo Valle, and Arroyo Las Positas, as well as runoff from

. These waters drain south through Arroyo de la Laguna to

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 of San Francisco Bay by way of Niles Canyon and a flood control channel. Along its course, ...

, ultimately ending up in

San Francisco Bay San Francisco Bay (Chochenyo language, Chochenyo: 'ommu) is a large tidal estuary in the United States, U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, California, San ...

History

Amador Valley was once marshland characterized by tules and

willow tree Willows, also called sallows and osiers, of the genus ''Salix'', comprise around 350 species (plus numerous hybrids) of typically deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions. Most species are known ...

s, with

Tulare Lake Tulare Lake () or Tache Lake ( Yokuts: ''Pah-áh-su'', ''Pah-áh-sē'') is a freshwater lake in the southern San Joaquin Valley, California, United States. Historically, Tulare Lake was once the largest freshwater lake west of the Mississippi R ...

at its center. Euro-American development in the 19th century reduced the marsh to Arroyo de la Laguna. The valley was named after José María Amador, a local ranchero who settled in the nearby Rancho San Ramon in 1834.

Notes

Valleys of Alameda County, California Valleys of California {{AlamedaCountyCA-geo-stub