Barrett

Owner: City of San Diego

Built: 1922

Water source: Natural Runoff, Upstream Releases

Dixon Reservoir

Owner: City of Escondido

Built: 1970

Water source: First Aqueduct

El Capitan Reservoir

Owner: City of San Diego

Built: 1934

Water source: Natural Runoff, First Aqueduct

Hodges

Owner: City of San Diego

Built: 1918

Water source: Natural Runoff, First Aqueduct

Lake Cuyamaca

Owner: Helix Water District

Built: 1887

Water source: Natural Runoff

Lake Henshaw

Owner: Vista Irrigation District

Built: 1923

Water source: Natural Runoff

Lake Jennings

Owner: Helix Water District

Built: 1962

Water source: First Aqueduct

Lake Poway

Owner: City of Poway

Built: 1971

Water source: First Aqueduct

Lake Ramona

Owner: Ramona Municipal Water District

Built: 1988

Water source: First Aqueduct

Lake Wohlford

Owner: City of Escondido

Built: 1924

Water source: Natural Runoff, Upstream Releases

Loveland Reservoir

Owner: Sweetwater Authority

Built: 1945

Water source: Natural Runoff

Lower Otay Reservoir

Owner: City of San Diego

Built: 1919

Water source: Upstream Releases, Second Aqueduct Natural Runoff

Maerkle

Owner: Carlsbad Municipal Water District

Built: 1963

Water source: Second Aqueduct, Treated

Miramar

Owner: City of San Diego

Built: 1960

Water source: Second Aqueduct

Morena

Owner: City of San Diego

Built: 1912

Water source: Natural Runoff

Morro Hill

Owner: Rainbow Municipal Water District

Built: 1971

Water source: Second Aqueduct, Treated

Murray

Owner: City of San Diego

Built: 1918

Water source: Upstream Releases, Second Aqueduct

Olivenhain

Owner: San Diego County Water Authority

Built: 2003

Water source: Second Aqueduct

Red Mountain

Owner: Fallbrook Public Utility District

Built: 1985

Water source: Second Aqueduct, Treated

San Dieguito Reservoir

Owner: San Dieguito Water District, Santa Fe Irrigation District

Built: 1918

Water source: Upstream Releases, Second Aqueduct

San Vicente Reservoir

Owner: City of San Diego

Built: 1943

Water source: Natural Runoff, Upstream Releases, First Aqueduct

Sutherland Reservoir

Owner: City of San Diego

Built: 1953

Water source: Natural Runoff

Sweetwater Reservoir

Owner: Sweetwater Authority

Built: 1888

Water source: Natural Runoff

Turner

Owner: Valley Center Municipal Water District

Built: 1971

Water source: First Aqueduct

Water Storage Overview

24 Reservoirs Store Local and Imported Supplies

Overview

Seven major stream systems originate in the mountains of San Diego County and drain into the Pacific Ocean. Runoff from these seven watersheds supplies 24 reservoirs with a combined capacity of about 723,000 acre-feet. In addition, San Diego County ratepayers have invested in reservoirs owned by the Metropolitan Water District of Southern California, and the Water Authority is seeking a storage account in Lake Mead as a low-cost way to increase reserves and provide water to the drought-stricken reservoir.

The last major increase in San Diego regional water storage capacity was in 2014 when the San Vicente Dam Raise was completed, adding 157,000 acre-feet of capacity. While the region’s reservoirs were built mainly as water supply projects, they also provide other benefits such as recreation, flood reduction and hydroelectric generation.

Each reservoir has unique characteristics that define its role as part of a larger water supply system. Some reservoirs are important from a regional water reliability standpoint, while others are primarily used by local agencies for operational flexibility.

Since the major statewide drought of 1976-1977, annual surface water use from local reservoirs has ranged from 4,071 acre-feet in fiscal year 2015 to 140,300 acre-feet in fiscal year 1984. Over the past two decades, annual local surface water use has averaged approximately 42,000 acre-feet, or about seven percent of the region’s average total annual water use.

Reservoir Storage Data

Each reservoir’s change in storage level is a function of its unique operational characteristics, which may include movement of imported and local water supplies in and out of the reservoir as well as surface water capture from local rainfall.

This reservoir data was updated on April 30, 2021