| Lake Mathews | |
|---|---|
 A view of Lake Mathews from behind the fenced boundary | |
  Lake Mathews  Lake Mathews | |
| Location | Riverside County, California |
| Coordinates | 33°50′25″N 117°26′07″W / 33.8403°N 117.4352°W[1] |
| Type | reservoir |
| Primary inflows | Colorado River Aqueduct |
| Primary outflows | Pipelines to member water agencies in the greater Los Angeles area |
| Basin countries | United States |
| Managing agency | Metropolitan Water District of Southern California |
| Max. length | 4 mi (6.4 km) |
| Max. width | 2 mi (3.2 km) |
| Average depth | Approx. 150 ft (46 m) |
| Water volume | 182,000 acre-feet (224 hm3) |
| Shore length1 | Approx. 14 mi (23 km) |
| Surface elevation | 1,391 ft (424 m) |
| Islands | several small islands; number present depends on reservoir level |
| 1 Shore length is not a well-defined measure. | |
Lake Mathews is a large reservoir in Riverside County, California, located in the Cajalco Canyon in the foothills of the Temescal Mountains.[1][2] It is the western terminus for the Colorado River Aqueduct that provides much of the water used by the cities and water districts of the Metropolitan Water District of Southern California (MWD). The reservoir is fenced and closed to all public access. The lake is near the Riverside community of Lake Hills, and is skirted by Cajalco Road on the south, El Sobrante Road on the north and east, and La Sierra Avenue on the west. La Sierra Avenue traverses the top of the west dike.
The reservoir was constructed by building a large earthfill dam across the northern side of the basin. Two smaller dams, called dikes, were built during the 1961 expansion to increase the lake's capacity.
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