Interlake Tunnel Project

Interlake Tunnel Project. Operationally, the Interlake Tunnel would divert water from Nacimiento Reservoir to San Antonio Reservoir that would have otherwise been spilled at Nacimiento Dam. The Nacimiento River basin produces nearly three times the average annual flow of the San Antonio River basin, therefore, capturing high Nacimiento River flows and diverting those flows to San Antonio Reservoir increases the overall storage capacity of the system. The Interlake Tunnel has been divided into three phases: project feasibility, including preliminary engineering and water rights requirements analysis; pre-construction tasks, including environmental review, permit applications, geotechnical and final design, right-of-way acquisition and financing arrangements; and construction. Per the owner, as of March 1, 2023, the owner states that a design team has been selected but information is not available at this time. The owner states that construction is about 5 years out.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Dam Construction and Equipment.