California State Water Project

California State Water Project
Name	California State Water Project
Country	United States
State	California
Agency	California Department of Water Resources
Formed	1957
Reservoirs	Oroville Reservoir, San Luis Reservoir, Castaic Lake, Pyramid Lake
Canals	California Aqueduct, East Branch, West Branch
Powerplants	Oroville Dam, Edward Hyatt Powerplant, San Luis Powerplant

Contents

California State Water Project is a statewide water storage and delivery system serving California with reservoirs, dams, aqueducts, pumping plants, and power facilities. It supplies municipal, industrial, agricultural, and environmental water needs across multiple regions including the Central Valley, Los Angeles County, and the San Francisco Bay Area. The project integrates infrastructure, policy, and financing from entities like the California Department of Water Resources, the United States Bureau of Reclamation, and regional water districts such as the Metropolitan Water District of Southern California.

Overview

The system was conceived to redistribute surface water from northern and central California watersheds such as the Feather River, Sacramento River, and San Joaquin River to meet demands in southern and coastal regions including Los Angeles County, Ventura County, and the San Joaquin Valley. Major structures include the Oroville Dam, the California Aqueduct, and the South Bay Aqueduct, connected to reservoirs like San Luis Reservoir and Castaic Lake. The project also incorporates hydroelectric facilities such as the Edward Hyatt Powerplant and interacts with federal projects like the Central Valley Project and local districts like the Santa Clara Valley Water District.

Planning traces to early 20th‑century proposals including the O'Shaughnessy Dam debates and legislative actions by the California State Legislature. Voters approved the project in the 1960s following studies by the California Division of Water Resources and advocacy by figures associated with the California Water Plan. Construction milestones included completion of Oroville Dam in 1968 and expansion projects coordinated with the Federal Power Commission and later the Federal Energy Regulatory Commission. The project evolved amid legal disputes like litigation involving the Natural Resources Defense Council and regulatory shifts triggered by the Endangered Species Act and state measures such as the California Environmental Quality Act.

Key dams and reservoirs include Oroville Dam (Feather River), San Luis Reservoir (San Joaquin Valley), Pyramid Lake and Castaic Lake (Angeles National Forest region). Conveyance features comprise the California Aqueduct with East and West Branches, the Delta–Mendota Canal linkage, and pumping plants such as the Edmonston Pumping Plant. Power and energy components include pumped‑storage at San Luis Reservoir and generation at the Edward Hyatt Powerplant and assorted peaking units coordinated with regional grids including California Independent System Operator operations. Interties connect with the Los Angeles Aqueduct and facilities managed by the Imperial Irrigation District and municipal suppliers like the City of San Diego.

Operations balance allocations to contractors including the Metropolitan Water District of Southern California, State Water Contractors, and agricultural districts across the Central Valley Project service area. Annual deliveries vary with hydrologic conditions influenced by the Sierra Nevada snowpack, El Niño–Southern Oscillation, and droughts referenced in state drought declarations by the Governor of California. Water transfers and banking arrangements involve entities such as the Los Angeles Department of Water and Power and groundwater sustainability activities under the Sustainable Groundwater Management Act. Allocations are adjusted under regulatory requirements from the California State Water Resources Control Board.

The project has altered habitats in the Sacramento–San Joaquin River Delta, affecting species like the Delta smelt and Chinook salmon, and prompted restoration efforts with stakeholders including the U.S. Fish and Wildlife Service and California Department of Fish and Wildlife. Water diversions have influenced land use in the Central Valley and urban growth in metropolitan areas like Los Angeles and San Francisco Bay Area counties. Controversies involve indigenous and tribal water rights claims by groups such as the Maidu and the Yurok Tribe, litigation involving environmental NGOs, and socio‑economic debates with agricultural interests exemplified by the Family Farm Alliance.

Administration is led by the California Department of Water Resources with financing from state general obligation bonds, revenue from water contractors, and fiscal oversight involving the California State Treasurer and legislative committees such as the California State Assembly Water, Parks and Wildlife Committee. Policy drivers include the California Environmental Quality Act, state bond measures like Proposition 1 (2014), and federal statutes including the Endangered Species Act. Governance requires coordination with agencies such as the Bureau of Reclamation, regional water districts, and resource planning bodies like the California Water Commission.

Challenges include climate change impacts on Sierra Nevada snowmelt, sea level rise affecting the Sacramento–San Joaquin River Delta, seismic vulnerability of infrastructure near the San Andreas Fault and Hayward Fault, and aging components requiring retrofit and seismic upgrades. Modernization efforts emphasize conveyance improvements, fish passage and habitat restoration projects coordinated with the National Marine Fisheries Service, implementation of advanced metering and telemetry with standards from the American Water Works Association, and integration of distributed storage, desalination projects like those in Santa Barbara and San Diego, and water recycling programs supported by the State Water Resources Control Board and local agencies.

Category:Water projects in California Category:Infrastructure in California