South Bay Aqueduct

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The South Bay Aqueduct is an aqueduct located in the eastern part of the San Francisco Bay Area. It conveys water from the Sacramento-San Joaquin Delta through over forty miles of pipelines and canals. It begins in north-eastern Alameda County on the California Aqueduct's Bethany Reservoir serving as the forebay. The aqueduct flows along the eastern and southern edges of the Livermore Valley. Then it flows through a series of tunnels to in end in the foothills of eastern San Jose, 5 miles (8 km) from downtown San Jose, CA.

Construction on the South Bay Aqueduct began in 1960. The Aqueduct was the first delivery system completed under the State Water Project and has been conveying water to Alameda County since 1962 and to Santa Clara County since 1965. The South Bay Aqueduct begins at Bethany Reservoir near Tracy, with the South Bay Pumping Plant lifting water 566 feet into the first reach of the Aqueduct. The South Bay’s Pumping Plant's nine pumping units, with a combined capacity of 330 cubic feet per second, discharge water through two parallel buried pipelines to the eastern ridge of the Diablo Range.

From there, water flows by gravity for nine miles to the 100 acre-foot Patterson Reservoir, where some water is released for delivery to Livermore Valley. Water flow then continues about nine miles to a junction point where a portion is diverted into a 1 1/2-mile branch line and pumped into Lake Del Valle.

Beyond the Del Valle junction, the water flows by pipeline to La Costa Tunnel, proceeds southwest past Sunol, through the Mission Tunnel, then south through the hills overlooking San Francisco Bay. South Bay Aqueduct terminates in a 160-foot diameter steel tank on a hillside five miles east of downtown San Jose.

Water agencies served

Alameda County Flood Control and Water Conservation District (Zone 7) - Maximum Annual Entitlement: 46,000 acre feet (57,000,000 m³)
Alameda County Water District - Maximum Annual Entitlement: 42,000 acre feet (52,000,000 m³)
Santa Clara Valley Water District - Maximum Annual Entitlement: 100,000 acre feet (120,000,000 m³)

Reservoirs

References

South Bay Aqueduct, Department of Water Resources, State of California

v t e California State Water Project

Dams	Antelope B.F. Sisk Bethany Castaic Cedar Springs Del Valle Elderberry Forebay Fish Barrier Frenchman Grizzly Valley Little Panoche Los Banos Dam O'Neill Oroville Perris Pyramid Quail Lake Thermalito Afterbay Thermalito Diversion Thermalito Forebay

Reservoirs	Antelope Lake Bethany Reservoir Castaic Lake Clifton Court Forebay Elderberry Forebay Frenchman Lake Lake Davis Lake Del Valle Lake Oroville Lake Perris Little Panoche Reservoir Los Banos Reservoir O'Neill Forebay Pyramid Lake Quail Lake San Luis Reservoir Silverwood Lake Tehachapi Afterbay Thermalito Afterbay Thermalito Forebay

Rivers and bodies of water	Feather River Piru Creek Sacramento River Sacramento–San Joaquin River Delta San Luis Creek

Aqueducts and canals	California Aqueduct Coastal Branch East Branch West Branch North Bay Aqueduct South Bay Aqueduct

Other facilities	Banks Pumping Plant Castaic Power Plant Devil Canyon Power Plant Dos Amigos Pumping Plant Edmonston Pumping Plant Feather River Fish Hatchery Kern River Intertie Oroville-Thermalito Complex South Bay Pumping Plant

Related	CALFED Bay-Delta Program California Department of Water Resources Peripheral Canal

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