Calero Reservoir, located in San Jose, California, is a vital water supply source managed by a public utility. Built in 1935, this Earth dam stands at 90 feet in height and has a storage capacity of 9,850 acre-feet, serving multiple purposes including irrigation, recreation, tailings, and water supply. The reservoir is situated along Calero Creek and covers a surface area of 337 acres, with a drainage area of 7.14 square miles.

Despite being classified as having a high hazard potential, Calero Reservoir is deemed to be in fair condition based on a 2017 assessment. The dam undergoes regular inspections, with the last one conducted in December 2020. Notable for its role in supplying water to the surrounding area, including Santa Clara County, this structure plays a crucial role in water resource management and climate resilience efforts in the region. With its impressive history and continued importance, Calero Reservoir remains a key asset for water management in California.