Project OVerview


Expansion of Los Vaqueros Reservoir improves Bay Area water supply reliability and water quality while protecting Delta fisheries and providing additional Delta ecosystem benefits.

The proposed project will include a regional intertie (the Transfer-Bethany Pipeline), improved pump stations and pipelines and could increase the reservoir’s capacity up to 275,000 acre-feet.

The proposed project builds upon the successful first phase of expansion from 100,000 to 160,000 acre-feet funded by the Contra Costa Water District and completed in 2012.

Los Vaqueros is one of the projects being evaluated in the context of a broader Bay Area effort to work collaboratively as a region to improve water supply reliability.

Phase 2 Los Vaqueros Reservoir Expansion Project Fact Sheet (PDF)

LVE-Fact-Sheet

Latest Project Updates

  1. CSU Civil Engineers Build Model to Test Design for $900M California Dam Project

    October 28, 2020 Colorado State University’s Hydraulics Lab recently demonstrated their newly constructed model of the Los Vaqueros Dam spillway and emergency outlet for stakeholders... Additional Info...
  2. Final Feasibility Report for the Phase 2 Los Vaqueros Reservoir Expansion Project now available

    August 14, 2020 The Bureau of Reclamation has released the Final Feasibility Report, which documents potential costs and benefits of the Los Vaqueros Reservoir Expansion Project. View the report, news release, and a statement from CCWD. Read on...
  3. RFQ for the Los Vaqueros Reservoir Expansion Transfer-Bethany Pipeline Project

    July 6, 2020 CCWD is seeking Statements of Qualifications from firms interested in providing professional services for the Los Vaqueros Reservoir Expansion Transfer-Bethany Pipeline Project. Read on...
  4. Board certifies the Final Supplement to the Final Environmental Document for Phase 2 LVE Project

    May 13, 2020 Contra Costa Water District’s Board of Directors adopted a resolution certifying the Final Supplement to the Final EIS/EIR and approved the Phase 2 Los Vaqueros Reservoir Expansion Project. Read on...
  5. Final Environmental Document published for Phase 2 Los Vaqueros Reservoir Expansion Project

    February 28, 2020 The Final Supplement to the Final EIS/EIR is now available to the public, and noticed in the Federal Register on February 28, 2020. Read on...
  6. Federal WIIN Act funding approved for Phase 2 Los Vaqueros Reservoir Expansion Project

    December 20, 2019 President Trump signed two spending bills to fund the federal government through fiscal year 2020 (FY20). $2.155 million for the Phase 2 Los Vaqueros Reservoir Expansion Project was included in the spending bills. Read on...
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What they are saying about Los Vaqueros Expansion

There is one dam-raising project that has drawn enthusiastic backing from environmental groups: expansion of the Los Vaqueros reservoir near Livermore. It promises to be a source of water for San Joaquin Valley wildlife refuges that often go dry in drought years.

San Francisco Chronicle
April 14, 2018

...Raising Los Vaqueros’ earthen dam by 55 feet has has drawn widespread support from both environmentalists and water agencies, including the Santa Clara Valley Water District and East Bay Municipal Utility District. It would provide storage for 275,000 acre feet of water, enough to meet the needs of an additional 575,000 people.

Mercury News & East Bay Times Editorial Boards
January 23, 2018

Expanding Los Vaqueros Reservoir is an innovative project that embodies what the voters approved when they passed Proposition 1, including significant, well-defined public benefits for the environment.

George Miller, Member of Congress, Retired
August 9, 2017

Working to expand water supplies for California’s next drought, a coalition of 12 Bay Area water agencies took a significant step Monday toward an $800 million expansion of one of the largest reservoirs in the Bay Area — Los Vaqueros Reservoir in the rolling hills near the Alameda-Contra Costa county line.

San Jose Mercury News
July 3, 2017

Additional flexibility for the water-supply system, water to benefit urban customers in the Bay Area, water for wetlands as well as for farmers and other water users south of the delta: Those are the reasons a dozen partners have joined in support of a proposed expansion of Los Vaqueros Reservoir.

Ag Alert
June 28, 2017

Millions of Bay Area residents could get extra drought insurance against water shortages and quality problems from a proposed $800 million expansion of the Los Vaqueros Reservoir that may have up to 10 water suppliers as partners.

East Bay Times
November 5, 2016

...This plan is amazingly simple. The height of the earthen dam would be raised by 51 feet to 269 feet. That would enable Los Vaqueros Reservoir to expand its capacity from 160,000 acre-feet of water to hold 275,000 acre-feet enough to serve 1.4 million residents on an annual basis.

San Jose Mercury News Editorial
April 28, 2016