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| San Luis & Delta-Mendota Water Authority | |
|---|---|
| Name | San Luis & Delta-Mendota Water Authority |
| Type | Water district |
| Formed | 1967 |
| Headquarters | Los Banos, California |
| Region served | Central Valley, California |
San Luis & Delta-Mendota Water Authority is a public agency formed to manage water delivery and represent water users served by the San Luis Reservoir, the California Aqueduct, and the Delta–Mendota Canal in the Central Valley (California). It contracts with the United States Bureau of Reclamation for project water from the Central Valley Project and engages with state agencies and environmental stakeholders over allocation, conveyance, and restoration issues. The authority serves a mix of agricultural districts, municipal suppliers, and reclamation districts across parts of Merced County, Stanislaus County, Fresno County, Madera County, San Benito County, and Santa Clara County.
The authority was organized in 1967 during an era shaped by the completion of the California State Water Project and expansion of the Central Valley Project, following earlier water law developments such as the Reclamation Act and the Water Rights Act. Early milestones include negotiations over construction of the San Luis Dam and coordination with the Bureau of Reclamation and the U.S. Department of the Interior. In the 1970s and 1980s the agency navigated evolving policy from the Environmental Protection Agency and state entities like the California Department of Water Resources amid competing interests from the City of Los Angeles, the Metropolitan Water District of Southern California, and agricultural districts such as the Westlands Water District. The 1990s and 2000s brought litigation involving the National Marine Fisheries Service and the U.S. Fish and Wildlife Service over endangered species protections implemented under the Endangered Species Act and related biological opinions affecting exports from the Sacramento–San Joaquin River Delta.
The authority is governed by a board composed of representatives from retail and irrigation districts, including delegates from entities like Westlands Water District, Santa Clara Valley Water District, and the San Benito County Water District. Its executive management has interacted with federal actors including officials from the Office of Management and Budget and state leadership from the California Natural Resources Agency. Interagency coordination involves agencies such as the Bureau of Reclamation, the California State Water Resources Control Board, and regional offices of the U.S. Fish and Wildlife Service. The board structure reflects political relationships among county supervisors, district general managers, and appointed directors drawn from groups like the Association of California Water Agencies.
The authority’s supply portfolio relies on facilities including the San Luis Reservoir, the O'Neill Forebay, the Delta–Mendota Canal, and interties with the California Aqueduct. Water sources include runoff from the Sierra Nevada (United States), storage releases controlled by the Central Valley Project Improvement Act, and allocations determined by the Bureau of Reclamation in coordination with the California Department of Water Resources. Conveyance infrastructure interfaces with projects such as the Friant Dam operations and the Contra Costa Canal via exchange contracts with entities like the Metropolitan Water District of Southern California and the Alameda County Water District. Pumping and delivery constraints are affected by operations at the State Water Project pumping plants and by Delta conveyance issues tied to the Delta Reform Act.
The authority manages long-term repayment and water service contracts with the Bureau of Reclamation for north-of-Delta storage and south-of-Delta delivery. Contractual frameworks involve exchanges with districts including Central Delta-Mendota Canal contractors and water purchase arrangements with the Oakdale Irrigation District and Turlock Irrigation District. Allocation decisions reflect federal Environmental Impact Statements prepared under the National Environmental Policy Act and biological opinions from the National Marine Fisheries Service. Disputes over allocation have prompted litigation in federal courts, including filings that invoked precedent from cases adjudicated by the United States Court of Appeals for the Ninth Circuit.
Environmental conflicts center on impacts to species such as the Delta smelt, Chinook salmon, and other anadromous fishes protected by the Endangered Species Act and managed under the Fish and Wildlife Coordination Act. Litigation has involved parties including the Natural Resources Defense Council, the State of California, and agricultural plaintiffs represented by counsel referencing regulatory actions by the U.S. Bureau of Reclamation. Water quality and salinity concerns engage the State Water Resources Control Board and regional boards like the Central Valley Regional Water Quality Control Board, while restoration initiatives connect to the CALFED Bay-Delta Program and the Central Valley Project Improvement Act’s habitat provisions. Legal outcomes have shaped operations at facilities such as the Bethany Reservoir and influenced proposals for the Delta Tunnel/California WaterFix and alternatives evaluated by the Delta Stewardship Council.
The authority participates in capital projects and programs including conveyance repairs, seismic upgrades at facilities like the San Luis Dam, and water management programs coordinated with Reclamation District partners. Collaborative programs include water banking and groundwater recharge efforts aligned with the Sustainable Groundwater Management Act and exchanges with entities such as the Metropolitan Water District of Southern California and the San Luis Reservoir State Recreation Area for multi-benefit uses. The authority has engaged in pilot projects for fish screens, real-time monitoring with the U.S. Geological Survey, and habitat restoration linked to CALFED science initiatives and collaborations with academic institutions like University of California, Davis.
Funding sources include assessments and revenues from water service contracts, repayment obligations under the Reclamation Act, federal appropriations from the United States Congress, and financing instruments coordinated with state programs such as the State Water Resources Control Board grants. Capital improvements and legal defense costs have been supported through bonds, reserve funds, and cost-sharing agreements with districts like Westlands Water District. Fiscal oversight involves audits and reporting consistent with standards applied by the Government Accountability Office and state auditors, and financial planning reflects risks from litigation, regulatory changes, and hydrologic variability influenced by California droughts and climate trends.
Category:Water management in California