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| Jones Pumping Plant | |
|---|---|
| Name | Jones Pumping Plant |
| Location | San Luis Reservoir, Merced County, California, United States |
| Operator | United States Bureau of Reclamation |
| Opened | 1968 |
| Purpose | Irrigation, water transfer, pumping |
Jones Pumping Plant
Jones Pumping Plant is a major waterlifting installation in California integral to the California State Water Project and the Central Valley Project. Located at the south end of San Luis Reservoir near Los Banos, California in Merced County, California, the plant pumps water into the California Aqueduct for delivery to the San Joaquin Valley, Santa Clara Valley, and metropolitan areas including Los Angeles and San Diego. It functions within a system operated by the United States Bureau of Reclamation in coordination with the California Department of Water Resources and various water districts such as the Westlands Water District and the Metropolitan Water District of Southern California.
Jones Pumping Plant serves as the principal lift station transferring water from the combined storage of San Luis Reservoir and the O'Neill Forebay into the California Aqueduct mainline. The facility works alongside the San Luis Dam and the upstream Doyle Pumping Plant and downstream structures like the Edmonston Pumping Plant and the Castaic Power Plant to route water between the Sacramento–San Joaquin River Delta and southern service areas. It operates in the context of statewide projects such as the Central Valley Project and interacts with major reservoirs including Shasta Lake, Folsom Lake, and Pyramid Lake through integrated water transfers.
Authorized as part of mid‑20th century water development schemes, the plant arose from joint planning by the United States Bureau of Reclamation and the California Department of Water Resources as a companion to the San Luis Reservoir project and the broader California State Water Project. Construction in the 1960s involved contractors tied to heavy civil works typical of the era and employed engineering practices comparable to those used at the Hoover Dam and Central Arizona Project facilities. The plant came online in 1968 amid debates involving representatives from the U.S. Congress, environmental advocacy groups such as the Sierra Club, and agricultural interests represented by the California Farm Bureau Federation and regional water districts.
Jones Pumping Plant comprises multiple vertical turbine pumps and motor-generator sets housed in a reinforced concrete structure adjacent to the O'Neill Forebay. The pumping units are driven by large synchronous motors rated in the tens of thousands of horsepower, similar in scale to units installed at facilities like Shasta Dam and Folsom Dam. The intake and discharge conveyance connect to lined canals and the California Aqueduct, incorporating gates, surge tanks, and control systems akin to those used at the Delta–Mendota Canal and Friant-Kern Canal. Instrumentation and controls historically paralleled standards set by the American Society of Civil Engineers and electrical specifications from the Institute of Electrical and Electronics Engineers.
Operational control of pumping schedules balances allocations from the Central Valley Project and the California State Water Project with hydrologic conditions in the Sacramento River and San Joaquin River basins. The plant lifts water approximately 244 feet (74 m) into the aqueduct system and can move hundreds of thousands of acre-feet per year during high allocation years, supporting irrigation for districts like Westlands, municipal supply for agencies such as the Metropolitan Water District of Southern California, and environmental flow commitments for areas including the San Joaquin River National Wildlife Refuge. Coordination with facilities such as Pacheco Reservoir and the Los Vaqueros Reservoir helps manage seasonal and interannual variability.
Jones Pumping Plant plays a central role in redistributing water that affects habitats in the San Joaquin Valley, the Sacramento–San Joaquin River Delta, and downstream estuarine environments near San Francisco Bay. Its operation influences water temperature, flow regimes, and salinity, factors relevant to species protected under statutes like the Endangered Species Act and managed by agencies including the U.S. Fish and Wildlife Service and the California Department of Fish and Wildlife. Environmental mitigation and water quality programs tied to the plant intersect with initiatives such as the Central Valley Project Improvement Act, the Bay-Delta Plan, and restoration efforts at locations like the San Luis National Wildlife Refuge.
Routine maintenance of turbines, motors, and gates follows practices endorsed by the United States Bureau of Reclamation and industry standards from organizations like the Hydropower Research Foundation. Major retrofit campaigns have addressed electrical modernization, vibration mitigation, and control system upgrades comparable to refurbishments undertaken at Shasta Dam and Folsom Dam. Funding and project oversight have involved federal appropriations debated in the United States Congress and implementation agreements with state partners including the California Department of Water Resources and local water agencies.
Access to the Jones Pumping Plant is via county roads connecting to Interstate 5 and state highways serving the San Joaquin Valley and Central Coast corridors. Nearby infrastructure includes the San Luis Reservoir Recreation Area, rail lines operated historically by carriers such as the Union Pacific Railroad, and agricultural conveyance systems supplying farmlands in counties like Merced County and Stanislaus County. The plant interfaces with regional power transmission managed by utilities such as Pacific Gas and Electric Company and the California Independent System Operator, which coordinate electrical supply for large motor loads.
Category:Buildings and structures in Merced County, California Category:United States Bureau of Reclamation dams and reservoirs Category:California State Water Project