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Calaveras Dam Replacement Project

Project Information
August 2011
April 2019
Cost $823 Million
Project Phase Construction
Additional Information

The information shown reflects the current forecast information published in the latest WSIP Quarterly Report.

Project Materials

Project Fact Sheet - Fall 2018
Spillway Media Fact Sheet

Naturally Occurring Asbestos Information and Data

Naturally Occurring Asbestos Questions and Answers
Air Monitoring Results

Environmental Impact Report

Volume 1      • Volume 5-6
Volume 2      • Volume 5-7
Volume 3      • Volume 5-8
Volume 4      • Volume 6
Volume 5-1   • Addendum 1
Volume 5-2   • Addendum 2
Volume 5-3   • Addendum 3
Volume 5-4  
Volume 5-5  

Summary Data Reports from
Air Monitoring Events

August 2008 through August 2009
September 2009 through July 2010
August 2010 through November 2010

Need more information? Contact:

Olivia Nunez
Phone: 925.493.4535

Betsy L. Rhodes
Phone: 415.554.3240

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What's New at Calaveras Dam?

Construction began in 2011 to build a new earth and rock fill dam adjacent to the existing dam. As of September 2018 construction on the embankment of the dam is complete. The replacement dam has reached its final height of 220 feet.  We began refilling Calaveras Reservoir this winter.

We have a great deal more to do before the entire project is complete. We must construct roads, work on site restoration, automation and instrumentation in the new dam, and finish the approach channel to allow water to eventually fill the space between the old dam and the new dam.

Project Description

The Calaveras Dam Replacement Project consists of building a new zoned earth and rock fill dam immediately downstream of the existing dam. The replacement dam will have a structural height of 220-feet high and is designed to accommodate a maximum credible earthquake on the Calaveras Fault. The dam will have a crest length of 1,210 feet, a base thickness of 1,180 feet, and crest thickness of 80 feet. The total volume of the dam will be approximately 3.5 million cubic yards. The replacement dam will restore the original reservoir capacity of 96,850 acre-feet, or 31 billion gallons of water. The storage is crucial to providing adequate water to our 2.7 million customers in the Bay Area.

Check out our time lapse video of our construction progress.


Last updated: 4/10/2019 12:30:39 PM