San Joaquin Valley – Westside

Source: CA DWR

San Joaquin Valley – Westside



Located in California’s Tulare Lake hydrologic region, the San Joaquin Valley – Westside is 621,823 acres in size. This High priority basin is home to an estimated 18,601 people (2010 value), which have been at a rate of 22.37.

San Joaquin Valley – Westside is a(n) basin with approximately 1253 wells, of which approximately 9 are water supply wells. Groundwater accounts for approximately 82.78 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2014: CASGEM basin prioritization – high

2016: Basin boundary modifications approved with Kings 5-022.08, Madera 5-022.06, Delta-Mendota 5-022.07 and Tracy 5-022.15 subbasins

An amended, approved modification was also made with the border of Pleasant Valley subbasin 5-022.09

Revised basin boundary description

2018: Draft priority – high. Groundwater level and subsidence comments:

  • CRITICAL OVERDRAFT. 1) CASGEM/WDL/GWIDS: No data or data insufficent to determine GWL status. Source: DWR 2) The canal, now considered the middle section of the California Aqueduct, passes through three major subsidence bowls: 1) southwest of Mendota, 2) near the town of Cantua Creek, and 3) near the town of Huron (Ireland and others, 1984). Because subsidence due to groundwater extraction had adversely affected the earlier-built Delta-Mendota Canal, designers incorporated as much as 10 feet of extra freeboard into the San Luis Canal, adding $30.7 million (2013 dollars) to construction costs. Sources: Land Subsidence from Groundwater Use in California, James W. Borchers, Michael Carpenter, Luhdorff & Scalmanini, California Water Foundation, April, 2014  2) Current Land Subsidence in the San Joaquin Valley, USGS; 3) Progress Report: Subsidence in the Central Valley, California, Jet Propulsion Laboratory, California Institute of Technology, NASA 2015-16

2018 Final Basin Prioritization: Basin priority remains unchanged at high priority.


GSA Information

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