Santa Clara Valley Water approves $1.88 billion contract for Anderson Dam rebuild

Santa Clara Valley Water has awarded a $1.88 billion construction contract to Flatiron Dragados Sukut ADSRP Joint Venture for the seismic retrofit of Anderson Dam. The $2.8 billion infrastructure project aims to strengthen regional water security and mitigate flood risks across Silicon Valley.

Santa Clara Valley Water has formally awarded a $1.88 billion construction contract to Flatiron Dragados Sukut ADSRP Joint Venture to execute the comprehensive seismic overhaul of Anderson Dam. The major undertaking carries an estimated aggregate cost of $2.8 billion, representing one of the largest infrastructure modernization initiatives in Santa Clara County's history. Full-scale physical construction work on the primary dam structure and spillway is slated to commence in early 2027, with an anticipated execution timeline spanning approximately seven years.

The project addresses severe structural vulnerabilities identified in the 1950-built reservoir, which serves as the largest water storage facility in the district's 10-reservoir network. Upon completion, the retrofitted facility will restore the reservoir to its full operational holding capacity, enhancing long-term water supply reliability and supporting regional groundwater recharge efforts across the San Francisco Bay Area.

Santa Clara Valley Water is an independent special district responsible for comprehensive water resources management, flood protection, and watershed stewardship for approximately two million residents in Santa Clara County, California. The public authority operates ten surface water reservoirs, three treatment facilities, and hundreds of miles of water conveyance channels.

To facilitate the primary rebuild while maintaining public safety during high-precipitation periods, preliminary engineering works are nearing completion. These early works feature a new 13-foot-diameter high-capacity diversion tunnel designed to replace the original 4-foot outlet pipe, allowing operators to better regulate water volume into Coyote Creek during major winter weather events.

From an industry standpoint, the massive capital outlay underscores a broader national priority focused on retrofitting aging civic infrastructure against climate volatility and seismic threats. Engineering and heavy construction firms operating in the water management segment are witnessing heightened demand for complex dam stabilization and spillway modernization projects.

For regional enterprises, utilities, and commercial real estate assets throughout Silicon Valley, the completion of the retrofit significantly reduces catastrophic flood risks along the Coyote Creek basin. In addition, restoring maximum storage capacity mitigates severe drought exposure for municipal water retailers and commercial consumers across the region.