New construction
Calaveras Reservoir is the largest drinking water reservoir in the local Bay Area. 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, and provide drinking water for 2.6 million people when at full capacity.
In addition to building a new zoned earth and rock fill dam immediately downstream of the existing dam, the project includes construction of a new 212 foot tall intake/outlet vertical shaft/tower 20 foot in diameter to convey water to and from the reservoir, and construction of structures for ancillary services, such as dam crest electrical building, valve vaults, stream maintenance discharge structure.