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Calero Reservoir, also called Calero Lake, is a reservoir in San Jose, California, located in the Calero neighborhood of Almaden Valley in South San Jose. It is the site of Calero County Park, which also includes a large area covering the lake and hundreds of acres of hills around it.
Calero Reservoir is the fourth largest reservoir owned by the Santa Clara Valley Water District. After capturing winter runoff from the nearby foothills and from water transferred, via a canal, from nearby Almaden Reservoir, reservoir water recharges groundwater basins and is also provided directly to water treatment plants, via the Almaden Valley Pipeline, to be treated and distributed to county residents. Calero Reservoir also can receive flows from Anderson Reservoir and San Luis Reservoir, via the recently restored Cross Valley and Calero pipelines which stretch , starting from the Coyote Pump Plant in Morgan Hill, extending through parts of unincorporated Santa Clara County, and ending at the Calero Reservoir in South San Jose.
Because alluvium deposits were found beneath the dam in a 2012 independent engineering study, and these could liquify in an earthquake, reservoir levels are currently maintained 19 feet below the spillway. Retrofit construction of the dam may begin only after the retrofit on Anderson Reservoir is complete in 2031. This restriction limits Calero Reservoir to 45% of capacity or about 4,414 acre-feet. When the Calero Dam retrofit is completed, the capacity of Calero Reservoir could be restored to 9,738 acre-feet and increase the outlet capacity from 50 cfs to up to 100 cfs.
Water from Calero Reservoir is carried downstream by Arroyo Calero, a tributary to Alamitos Creek, which is in turn tributary to the Guadalupe River and thence to south San Francisco Bay.
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