This paper describes the proposed California WaterFix tunnels project in the Northern California Delta region from the context of the recently completed environmental (EIR/EIS) process for the project. The conceptual engineering effort led to development of a project that will include more than 70 miles of large diameter tunnels. The new system ensures water supply reliability while minimizing environmental impacts to the surrounding Delta area. The project's main twin-bore 40-foot ID tunnels will utilize a single-pass precast concrete segmental liner. Preliminary design of the project components is planned to commence in 2018. Current implementation plans will be discussed in the paper. The overall budget for the tunnels, pump plant, river intakes and appurtenant facilities is $14.9 billion in 2014 dollars.
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