Stone Canyon Reservoir
| Stone Canyon Reservoir | |
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| Coordinates | 34°6′40″N 118°27′16″W / 34.11111°N 118.45444°WCoordinates: 34°6′40″N 118°27′16″W / 34.11111°N 118.45444°W |
| Built | 1952 |
| Surface elevation | 843 feet (257 m) |
| Settlements | Bel Air, Los Angeles, California, USA |
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 847 feet (258 m) 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.
It 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.
At least part of the lower reservoir expansion included asphalt linings. Some of the landslides at the upper reservoir were caused by undercut grading. To compact the area brush and reduce the height of the flammable materials, heavy drums were filled with water and then rolled up and down the slopes. Proposed 2004 system changes included removing the reservoir from normal operating service, and retaining it for emergency storage only.
The Stone Canyon Reservoir is a complex of two reservoirs, namely, the Stone Canyon Reservoir (also known as the Lower Reservoir) at 34°6′24″N 118°27′09″W / 34.10667°N 118.45250°W and the Upper Stone Canyon Reservoir at 34°07′06″N 118°27′21″W / 34.11833°N 118.45583°W. The elevation of the Lower Reservoir is 243 feet (74 m) at full reservoir level and 247 feet (75 m) at maximum water level. Both reservoirs, with open surface, when built stored treated drinking water. This enabled surface water runoff to flow into the reservoir. However, this also resulted in contamination of the water.
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