| Crystal Springs Reservoir | |
|---|---|
 Lower Crystal Springs Reservoir as viewed from the Sawyer Camp Trail | |
  Crystal Springs Reservoir  Crystal Springs Reservoir | |
| Location | Santa Cruz Mountains San Mateo County, California |
| Coordinates | Lower reservoir 37°31′41″N 122°21′54″W / 37.5280°N 122.3650°W Upper reservoir 37°29′57″N 122°20′20″W / 37.4993°N 122.3389°W |
| Type | Reservoir |
| Primary inflows | San Mateo Creek, San Andreas Creek, Adobe Gulch, Laguna Creek, Hetch Hetchy Aqueduct |
| Primary outflows | San Mateo Creek |
| Catchment area | 29.4 sq mi (76 km2) |
| Basin countries | United States |
| Managing agency | San Francisco Public Utilities Commission |
| Surface area | 1,323 acres (535 ha) |
| Water volume | 57,910 acre⋅ft (71,430,000 m3) |
| Surface elevation | 85 m (279 ft) |
| References | U.S. Geological Survey Geographic Names Information System: Crystal Springs Reservoir |
Crystal Springs Reservoir is a pair of artificial lakes located in the northern Santa Cruz Mountains of San Mateo County, California, situated in the rift valley created by the San Andreas Fault just to the west of the cities of San Mateo and Hillsborough, and I-280. The lakes are part of the San Mateo Creek watershed. Crystal Springs Regional Trail runs along the reservoir.