The New Irvington Tunnel is officially in service carrying drinking water to our 2.6 million Bay Area customers. Construction on the project reached substantial completion on September 19, 2015 and is 99% complete. The project will reach final construction completion in August 2016.
The New Irvington Tunnel Project completes the last of three tunnels in the Water System Improvement Program (WSIP), creating a critical water lifeline that is able to withstand earthquakes on the Hayward, Calaveras, and San Andreas faults. This new seismically-designed tunnel is 3.5 miles long and is located between the Sunol Valley and Fremont. The project is part of the agency’s $4.8 billion Water System Improvement Program. The tunnel was constructed by the joint venture with Southland Tutor Perini who began tunneling work in March 2011.
- Tunnel Length: 18,660 feet or 3.5 miles
- Location: Parallel to the existing tunnel between Sunol Valley and the City of Fremont
- Depth: Between 30 feet and 700 feet underground
- Finished internal diameter: 8.5 feet
- More than 7.8 million pounds cement grout injected into the tunnel for groundwater infiltration control
- The New Irvington Tunnel will carry approximately 90 million gallons of water a day on average during normal operating conditions when both tunnels are in service. There is an additional 90 million gallons of water per day flowing through the existing tunnel
Now that the tunnel is in service, the construction team completed the portal structures at the ends of the new tunnel and completed restoration of the above ground facilities, which includes earth fill to original grades, and placement of topsoil and hydroseed. The SFPUC also took the existing tunnel out of service for inspection and repairs in March 2015. Both tunnels will remain in service during normal operations.
Check out the video of the final hole-through which took place on October 8, 2013.
The New Irvington Tunnel runs 3.5 miles with an internal diameter of approximately 8.5 feet. It lies parallel to the existing tunnel between the Sunol Valley south of Highway I-680 and Fremont, California.
The new tunnel will provide a seismically-designed connection between water supplies from the Sierra Nevada Mountains and the Alameda Watershed to Bay Area water distribution systems.