Cogswell Dam
| Cogswell Dam | |
|---|---|
Satellite view | |
| Country | United States |
| Location | San Gabriel Mountains, Angeles National Forest, Los Angeles County, California |
| Coordinates | 34°14′41″N 117°57′55″W / 34.24472°N 117.96528°W |
| Opening date | 1935 |
| Owner(s) | Los Angeles County Department of Public Works |
| Dam and spillways | |
| Type of dam | Rock-filled |
| Impounds | West Fork San Gabriel River |
| Height | 266 ft (81 m) |
| Height (foundation) | 280 ft (85 m) |
| Length | 585 ft (178 m) |
| Spillway capacity | 59,900 cu ft/s (1,700 m3/s) |
| Reservoir | |
| Creates | Cogswell Reservoir |
| Total capacity | 12,234 acre⋅ft (15,090,000 m3) |
| Catchment area | 38.4 sq mi (99 km2) |
| Surface area | 146 acres (59 ha) |
Cogswell Dam is a rockfill dam on the West Fork of the San Gabriel River in Los Angeles County, California. It is located in the San Gabriel Mountains, northeast of Mount Wilson, and within the Angeles National Forest.
It forms Cogswell Reservoir, which has a capacity of 8,969 acre-feet (11,063,000 m3).
The dam serves mainly for flood control in conjunction with San Gabriel Dam and Morris Dam downstream. San Gabriel Dam lies 13 miles (21 km) downstream.