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Almaden dam and reservoir

Almaden dam and reservoir is one of the six original reservoirs in the county. It was completed in 1935. "Almaden" in Spanish means "mineral" or "mine." In 1845 Andres Castillero discovered a quicksilver (mercury) deposit in the area now known as the Almaden hills. At one time, the New Almaden Mine was the largest mercury-producing mine in the Americas. The dam and reservoir are located in these same hills. The reservoir can store 1,586 acre-feet of water. Its surface area is 57 acres. *

The Almaden Dam Program includes construction, inspection and maintenance activities. More information...

Photo of Almaden Reservoir

*Reservoir storage values have been updated to reflect recent survey results.

Related Information

What is the current water level of this reservoir?

Dam safety project fact sheet [PDF 248KB]

Other information about this watershed

Link to District 1 Board Director Rosemary Kamei's Web page

Providing stream stewardship, wholesale water supply and flood protection for Santa Clara County.