About the Project

The Los Vaqueros Reservoir Expansion Project will increase Bay Area and Central Valley water supply reliability, develop water supplies for wildlife refuges, and improve water quality while protecting Delta fisheries and providing additional Delta ecosystem benefits.

When completed, it will increase the Los Vaqueros Reservoir capacity from 160,000 acre-feet to 275,000 acre-feet and add new and modified conveyance facilities to provide environmental, water supply reliability, operational flexibility, water quality, and recreational benefits.


Water for Wetlands

Reliable water for South of Delta
wildlife refuges

Water for Communities

Reliable water supply for 11M

Regional Integration

High potential for regional water
system integration

Economic Growth

Anticipated creation of up to
20,000 jobs

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Federal funding from Congress

  • Supports wildlife refuges
  • Water Infrastructure Improvements for the Nation (WIIN) Act and Bipartisan Infrastructure Law 

State funding from the California Water Commission

  • Supports wildlife refuges, emergency response, and recreation 

Local funding from partner agencies

  • Supports regional water supply reliability

  • LV JPA is seeking a low-interest, federal loan* 

Total project cost as of September 2023: $1.377B

  • Since November 2014, inflation has increased construction costs by more than 40%** 

* Water Infrastructure Finance and Innovation Act
** Engineering News Record Index 


2024 - Phase 2 Expansion
Capacity: 275,000 acre ft.
Dam Heigh: 281 ft.

2012 - Phase 1 Exoansion
Capacity: 160,000 acre ft.
Dam Heigh: 226 ft.

1998 - Original DAM Construction
Capacity: 100,000 acre ft.
Dam Heigh: 192 ft.

Project Timeline

  • July 2018

    Preliminary California Water Commission (CWC) eligibility and funding decisions
  • 2020-2023

    Permitting, agreements, and design
  • February 2020

    Final Supplement to the Final EIS/EIR
  • August 2020

    Final Federal Feasibility Report
  • October 2021

    Formation of Joint Powers Authority
  • 2023-2024

    Final agreements and California Water Commission (CWC) funding award
  • 2025-2031

  • 2025

    Construction begins on Transfer-Bethany Pipeline
  • 2026

    Construction begins on Los Vaqueros Dam Expansion

Established in October 2021, the Los Vaqueros Reservoir Joint Powers Authority (JPA) is a unique and diverse regional partnership of eight Member Agencies working to improve water supply reliability for Californians and their environment. The JPA is responsible for the governance and administration of the Los Vaqueros Reservoir Expansion Project.

JPA Members Serving Diverse Beneficiaries

Alameda County Water District

Contra Costa Water District>

City of Brentwood

East Bay Municipal Utility District

Grassland Water District

Santa Clara Valley Water District

San Francisco Public Utilities Commission

Bay Area Water Supply & Conservation Agency (BAWSCA)*

San Luis & Delta-Mendota Water Authority

Zone 7 Water Agency

Taryn Ravazzini
Executive Director

Los Vaqueros Reservoir JPA
1331 Concord Ave., Concord, CA 94520
916-206-5367 | info@losvaquerosjpa.com