California is moving forward with one of its largest water infrastructure projects in decades following state approval of a key permit for the proposed Sites Reservoir in the Sacramento Valley.
The State Water Resources Control Board voted Wednesday, November 5, to approve the project’s water permit, clearing a major regulatory milestone for the approximately $7 billion development. If completed, Sites Reservoir would be California’s first major new reservoir since New Melones Lake was completed in 1979.
The proposed reservoir, located in Glenn and Colusa counties, would have a capacity of approximately 1.5 million acre-feet. It is designed to capture excess water from the Sacramento River during periods of heavy rainfall and make that water available during droughts and other periods of limited supply.
Project proponents say the reservoir could provide water to approximately 24 million Californians during emergency conditions, benefiting communities, agricultural operations and other water users throughout the state.
California officials have identified expanded water storage as an important component of the state’s climate resilience strategy. More variable precipitation patterns, prolonged droughts and increasingly intense storms have highlighted the need for infrastructure capable of capturing water when it is available and distributing it when supplies are constrained.
For California’s seafood and fisheries sectors, water management decisions have implications beyond municipal and agricultural supply. River flows, water temperatures, water quality and seasonal freshwater availability all play important roles in maintaining healthy aquatic ecosystems and supporting fisheries resources.
The project has faced opposition from tribal representatives and environmental organizations concerned about impacts to ancestral lands, cultural resources, salmon and other native fish. Critics have also questioned potential effects on water quality, including the risk of harmful algal blooms and mercury contamination, and have emphasized the importance of maintaining adequate cold-water flows for fish populations.
Project representatives say the proposal has undergone extensive review and multiple revisions intended to address stakeholder concerns. However, the competing priorities surrounding the project illustrate the complexity of developing major water infrastructure in a state where communities, agriculture, fisheries and ecosystems all depend on increasingly constrained water resources.
Following permit approval, the Sites Project Authority is seeking additional funding commitments from participating water districts and state and federal governments. Construction could begin as early as summer 2027, subject to financing and other project requirements.
Why it matters: California’s water infrastructure decisions have far-reaching implications for the state’s food production systems, commercial fisheries and aquatic resources. As the state pursues additional storage capacity, maintaining healthy river systems, protecting fish populations and balancing competing water demands will remain important considerations for the seafood industry.