| Cogswell Dam | |
|---|---|
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| Country | United States |
| Location | California |
| Coordinates | |
| Opening date | 1935 |
| Dam and spillways | |
| Height | 266 ft (81 m) |
| Length | 585 ft (178 m) |
| Impounds | West Fork San Gabriel River |
| Reservoir | |
| Creates | Cogswell Reservoir |
| 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 forms Cogswell Reservoir, which has a capacity of 12,234 acre·ft (15,090,000 m3) with an average storage of 8,969 acre·ft (11,063,000 m3), and serves mainly for flood control in conjunction with San Gabriel and Morris Dams downstream.