San Vicente Dam Raise – San Diego County, CA

Project Details
  • San Diego County Water Authority
Project Value

$140 million

Project Duration


Services Provided

Construction management

Emergency Water Storage

Parsons, in a joint venture (JV), managed construction of the San Vicente Dam Raise Project, the tallest dam raise in the United States and the tallest roller-compacted concrete dam raise in the world. The project, located in San Diego County, CA, reduced the region’s reliance on imported water supplies and provided a more flexible conveyance system for use during emergencies. The project also elevated the existing 220-ft-high dam—built in 1943—by 117 ft, more than doubling the reservoirs storage capacity. The new water storage capacity brought the total reservoir expansion to 152,000 acre-ft and served two purposes:

  • Two-thirds of the additional storage (100,000 acre-ft) captures surplus water during wet seasons for use during subsequent dry years.
  • The other third of the new reservoir capacity (52,000 acre-ft) stores water for use if an emergency cuts off the San Diego region’s imported water supply.

Our JV team provided preconstruction services through constructibility reviews, independent construction management schedules and cost estimates, and contractor prequalification. During construction, we worked with our client, the San Diego County Water Authority, to provide construction administration, inspection, change management, schedule monitoring, and quality assurance/control, including startup and testing support. We also provided a whole host of other services.

The San Vicente Dam Raise Project is one of many major Parsons projects in southern California that has improved residents’ quality of life. Built to remain operational during a major earthquake, the dam provides San Diego County residents with a secure water source, supports the local economy, and offers enhanced recreation opportunities on the expanded reservoir.

Featured Aug 2011/Updated Jul 2017

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