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Lower Crystal Springs Dam Pond Repair Project ~ Bridge Opens 3 Weeks Early

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ARTICLE. Lower Crystal Springs Dam Pond and Parapet Project Completed on March 16th, 2020.

Construction Work that Closed Lower Crystal Springs Dam Bridge to Cars Completed Three Weeks Early on March 16, 2020.

The San Francisco Public Utilities Commission (SFPUC) owns and operates a regional water system that includes the Crystal Springs Watershed and serves 2.7 million Bay Area customers. 

The Crystal Springs Dam Bridge sits on top of Lower Crystal Springs Dam. Crews completed two minor construction projects on top of the dam three weeks ahead of schedule. The bridge will reopen to all vehicular traffic, and there will no longer be any impacts to the trail, effective March 16, 2020. 

Crews utilized a crane to transport equipment and supplies to the top of the dam. The crane occupied most of the Bridgeway, which prompted the weekday closure of the bridge to cars. The construction work has been successfully completed.

Thank you for your continued support as we maintain the Hetch Hetchy Regional Water System.

Construction Crews utilize a crane to lower equipment and supplies to the crest of Lower Crystal Springs Dam to complete two minor construction projects.

What is happening:

  • Crews representing the San Francisco Public Utilities Commission (SFPUC) successfully completed two minor construction projects on top of Lower Crystal Springs Dam a full three-weeks ahead of schedule.
    • Crews addressed the issue of water ponding on the dam and filled a gap in the parapet wall.
    • SFPUC had received permission to temporarily close Lower Crystal Springs Dam Bridge because of the need to use a crane to transport equipment or power tools and material to the dam crest. The footings of the crane and the crane arm will take up most of the Bridgeway, which prompted the need to close the bridge during the work.
  • The construction team completed their work three weeks ahead of schedule. The bridge will reopen on March 16, 2020 to all traffic. There will no longer be any impacts to the bridge or trail. 

 

Background:

  • The San Francisco Public Utilities Commission (SFPUC) owns and operates the Hetch Hetchy Regional Water System, which delivers drinking water to 2.7 million people in four Bay Area Counties.
  • We own approximately 23,000 acres of watershed land on the Peninsula. The three reservoirs located there: Pilarcitos, Crystal Springs, and San Andreas, serve approximately one million people in northern San Mateo County and San Francisco county.
  • Lower Crystal Springs Dam impounds water at Crystal Springs Reservoir.
    • The SFPUC performed upgrades to the dam (built in 1888) to allow it to accommodate revised evaluations for a maximum probable flood.
    •  At the end of 2018, a newly-constructed Bridge over Lower Crystal Springs Dam was constructed by San Mateo County. 

 

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