Cogswell Reservoir
Reservoir Levels • Weather • Hydrology
Cogswell Reservoir is a man-made reservoir located in the San Gabriel Mountains of Los Angeles County, California. The reservoir was built in 1954 by the Los Angeles County Department of Public Works as part of the San Gabriel River Watershed. It is a significant source of drinking water for the region and can store up to 8,000 acre-feet of water.
Cogswell Reservoir is fed by both surface flow and snowpack from the San Gabriel Mountains. The San Gabriel River, which originates from the mountains, is the primary surface flow provider to the reservoir. Snowmelt from the surrounding mountains also contributes to the reservoir's water supply.
The water from Cogswell Reservoir is used for both agricultural and recreational purposes. The water is mainly used for irrigation in the San Gabriel Valley, while recreational activities such as fishing, boating, and hiking are also popular in the area. The reservoir is managed by the Los Angeles County Department of Public Works and is an important source of water for the region.
May 20, 2024
°F
°F
mph
Windspeed
%
Humidity
| Storage 24hr Change | None% |
| Percent of Normal | None% |
| Minimum |
15 acre-ft
2021-09-06 |
| Maximum |
8,892 acre-ft
2023-01-18 |
| Average | acre-ft |
| Nid_Height | 266 |
| Hydraulic_Height | 239 |
| Drainage_Area | 38.4 |
| Year_Completed | 1935 |
| Dam_Height | 266 |
| Primary_Dam_Type | Rockfill |
| Surface_Area | 146 |
| Hazard_Potential | High |
| Nid_Storage | 8969 |
| River_Or_Stream | Wfk San Gabriel R |
| Dam_Length | 585 |
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