Storage Levels Hydrology Weather

California San Gabriel Watershed

Cogswell Reservoir

June 6 2023

154 acre-ft

None% today
None% of Normal Very Low

Water storage levels at Cogswell Reservoir are currently 154 acre-ft, about None% of normal. The average for this time of year is approximately Noneacre-ft.

Maximum recorded Storage since record keeping began in 2021 was 2023-01-18 when levels reached 8,892 acre-ft. Lowest recorded Storage was 2021-09-06 when levels receded to 15 acre-ft.

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.

Geolocation -117.965, 34.245
Elevation 2,405 ft
Storage 24hr Change None%
Percent of Normal None%
Minimum 15 acre-ft
Maximum 8,892 acre-ft
Average acre-ft
Nearby Reservoirs
Tinemaha Reservoir
Lake Crowley
Railroad Canyon
Santiago Creek Res (Irvine Lake)
Lake Mathews
Prado Dam
San Gabriel
Cogswell Reservoir


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