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Bid Details
HH-1000
Mountain Tunnel Improvement Project

Bid due

10/01/2019
9:00 AM

  • Type Construction
  • Department Hetch Hetchy Water & Power
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Project Description
Qualification and bid documents are not yet available for this contract.  A bid date has not yet been established.

About Mountain Tunnel
The San Francisco Public Utilities Commission (SFPUC) is proposing the Mountain Tunnel Improvements Project (project) to improve the condition of the existing Mountain Tunnel (tunnel), and to ensure the tunnel’s continued ability to provide quality drinking water reliably to its 2.7 million customers in the Sierra Foothills  and San Francisco Bay Area. The project is in the central Sierra Nevada Mountain Range near the town of Groveland in Tuolumne County.

Mountain Tunnel is an approximately 19-mile-long water tunnel that has been serving the Bay Area since 1925 as  part of the Hetch Hetchy Regional Water System. It transmits drinking water originating from Hetch Hetchy Reservoir through Kirkwood Powerhouse, where it generates hydropower, to Priest Reservoir downstream. Water flows entirely  by gravity through this tunnel, which is unlined upstream for over 7 miles and has an unreinforced concrete lining for 11 miles in its downstream section.

Constructed between 1917 and 1925, this tunnel has been in service for more than 90 years. Inspections of the  tunnel showed deterioration of the tunnel lining and other deficiencies of the Mountain Tunnel. These deficiencies result in reduced flow rate, increased groundwater intrusion, and increased turbidity. The deficiencies also diminish the ability to provide drinking water reliably to customers, and increase the difficulty of performing maintenance in  the tunnel during normal operation.

Request for proposal

  • ESTIMATED COST
    $140,000,000
  • DUE DATE
    10/01/2019
  • DUE TIME
    9:00 AM
  • DURATION
    7 years
  • LOCATION
  • CONTACT
    Contract Administration Bureau

Pre-Bid Conference

  • DATE
  • TIME
  • ATTENDANCE
    Not Mandatory
  • LOCATION
  • ADVERTISEMENT DATE
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