Stone Canyon Reservoir

Stone Canyon Reservoir and Upper Stone Canyon Reservoir are adjoining reservoirs in the Westside region of Los Angeles, California. Situated in the Santa Monica Mountains at 847 feet above sea level, the reservoirs lie in the Bel Air neighborhood, 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.

The reservoirs are owned by the Los Angeles Department of Water and Power. The main reservoir, which is the lower reservoir and the larger of the two, is situated south of the upper reservoir. It was designed and built in 1924 by the Los Angeles Department of Water and Power, then named the Bureau of Water Works and Supply . As with most other BWWS reservoirs of the time, it is of earth fill construction which was placed utilizing the hydraulic sluicing method. This method was pioneered and refined by William Mulholland. This reservoir had an original capacity of 8,000 acre⋅ft .

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