Stone Canyon Reservoir

Stone Canyon Reservoir and Upper Stone Canyon Reservoir are adjoining reservoirs in the Westside district of Los Angeles, California, located in the neighborhood of Bel Air. Situated in the Santa Monica hills at above sea level, the reservoirs lie south of Mulholland Drive and west of North Beverly Glen Boulevard. The main reservoir is the Stone Canyon Reservoir with the much smaller, cone-shaped Upper Stone Canyon Reservoir adjoining it to the north. The two reservoirs supply the Westside water subsystem, including service to around 400,000 people in Pacific Palisades, the Santa Monica Mountains, and West Los Angeles.HistoryIt was established in 1952 for a total of around $9 million. Construction was partly funded by the California Department of Transportation Environmental Enhancement and Mitigation Grant Program. Taking advantage of the natural terrain, an inclined tower was built that eliminated the need for an access bridge and reduced the unit bearing load. A somewhat unusual change in radon level began at the canyon in 1984, possibly a result of a reservoir level change.