Delta Conveyance Project

The Delta Conveyance Project would modernize the water transport infrastructure of the State Water Project in the Delta by adding new facilities to divert water and upgrading the current conveyance system to also include a single underground tunnel. The Delta Conveyance Project includes the following main construction components: North Delta Intakes, tunnels and shafts, a pumping plant and connections to existing facilities in the south delta, and other features to support construction activities.

The Project that the Department of Water Resources (DWR) analyzed in the Environmental Impact Report (EIR) is the Bethany Reservoir Alignment. It consists of two 3,000 cubic feet per second conveyance facilities constructed on an eastern alignment roughly parallel to Interstate 5 to a site south of the Byron Highway, adjacent to the existing Bethany Reservoir. The Delta Conveyance Project is very different from the State’s previous proposals. The project has been downsized, refined, rerouted, and redesigned. See a comparison here.

For more detailed information on facility locations, site plans, construction site photos and proposed routes for construction traffic:
Delta Conveyance Project Map Book

NOTE: Maps are for discussion purposes only and are subject to change.


Delta conveyance refers to State Water Project infrastructure in the vast network of waterways comprising the Sacramento-San Joaquin Delta (Delta) that collects and moves fresh affordable water to homes, farms and businesses throughout major regions of the state from the Bay Area to southern California. The Department of Water Resources (DWR) is the owner and operator of the State Water Project and is responsible for all associated upgrades and maintenance, including the Delta Conveyance Project that will modernize State Water Project conveyance.
Visit Delta Conveyance on DWR’s website for more info »


Under the direction of California’s Department of Water Resources (DWR), the Delta Conveyance Design and Construction Authority’s purpose is to design, develop, and implement the proposed Delta Conveyance program, an infrastructure project to support the resiliency of California’s fresh water supply via a proposed single tunnel solution.

The Delta Conveyance Design and Construction Authority (DCA) conducts engineering and design work to inform DWR’s environmental review and planning process of a Delta Conveyance Project. For more information about the work of the DCA, see the video here.


The DCA presents information through a variety of channels including social media, public presentations, conferences, and community meetings in order to:

  • Provide clear, concise, accessible and timely information to the public
  • Facilitate public participation in the planning process
  • Improve mutual understanding, encourage dialogue and facilitate constructive public input
  • Build trust through transparency, commitment and follow-through

In 2019, the DCA Board formed a Stakeholder Engagement Committee (SEC) of community members who live and work in the Delta. The goal was to integrate community-focused modifications into the planning and conceptual design of the proposed project. Feedback sought included traffic flow, optimal stockpile locations, uses for recycled tunnel material, tunnel shaft placement, and efficient materials movement.

In 2021, DCA engineers completed preliminary conceptual designs for the California Department of Water Resources to be used in environmental evaluation of the proposed project alternatives, as required by the California Environmental Quality Act (CEQA). Results of SEC feedback included adjustments to facilities locations, the elimination of an intermediate forebay, proposed road improvements to address traffic concerns, and the reduction of the project footprint in several areas.

The SEC was officially sunset in January 2022. The SEC White Paper here summarizes the SEC formation and operation and provides a resource for future advisory or similar committees if Delta Conveyance is approved.

More information on the SEC, including all meeting materials and videos, can be found here: SEC Meetings.

Monthly Board Reports View All Reports »