Storage Levels Hydrology Weather

California Upper Merced Watershed

Lake Mc Swain

June 6 2023

10,425 acre-ft

+0.06% today
119% of Normal High

Water storage levels at Lake Mc Swain are currently 10,425 acre-ft, about 119% of normal. The average for this time of year is approximately 8,693.5acre-ft.

Maximum recorded Storage since record keeping began in 2020 was 2023-04-26 when levels reached 10,477 acre-ft. Lowest recorded Storage was 2020-11-11 when levels receded to 6,094 acre-ft.

Lake McSwain is a reservoir located in Mariposa County, California. The lake was constructed in 1967 as part of the Merced River Flood Control Project. Water is supplied from the nearby Merced River, snowpack from the Sierra Nevada Mountains, and rainfall. The lake is primarily used for hydroelectric power generation but also provides irrigation for nearby agricultural lands. Recreational activities include fishing, boating, and camping. The lake is stocked with rainbow trout, brown trout, and catfish. The lake and surrounding area are managed by the Merced Irrigation District. Despite being a man-made lake, it provides a vital habitat for a range of species, including bald eagles and black bears.

Geolocation -120.309, 37.520
Elevation 425 ft
Storage 24hr Change 0.06%
Percent of Normal 119%
Minimum 6,094 acre-ft
Maximum 10,477 acre-ft
Average 8,694 acre-ft
Nearby Reservoirs
Los Banos Dam
Friant Dam (Millerton)
San Luis Reservoir (State)
San Luis Reservoir (Federal)
Oneill Forebay
New Exchequer-Lk Mcclure
Modesto Reservoir
Don Pedro Res Nr La Grange Ca
Don Pedro Reservoir
Goodwin Dam


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