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Seismic and Hydraulic Rehabilitation of Big Tujunga Dam

Informed decisions create resiliency

  • $2M

    Cost Savings/Year

  • Los Angeles, California

    Los Angeles, California

Upgrading one of California’s largest dams to protect against seismic and flood concerns

The 244 foot tall Big Tujunga Dam, nestled in the San Gabriel Mountains northeast of Los Angeles, California, was originally completed in 1931. Stantec worked with the Los Angeles County Department of Public Works (LACDPW) to perform rehabilitation and spillway modification to help meet the updated standards for Maximum Credible Earthquake (MCE) and Probable Maximum Flood (PMF) scenarios.

LACDPW commissioned Stantec to conduct studies to reanalyze both the seismic and hydraulic issues related to the dam, which was operating at 25 percent storage capacity due to seismic safety concerns for more than 30 years. The studies confirmed the dam’s inability to handle MCE and PMF, and proposed a number of alternatives for both the seismic and hydraulic rehabilitation.

LACDPW selected the alternative design recommended by Stantec to strengthen the dam by adding concrete against the downstream side of the dam to create a “thick arch” in combination with construction of a new ogee crest spillway with flip-bucket. We provided optimized and efficient design solutions for the rehabilitation of both the dam and spillway, and provided engineering services during construction.

At a Glance

Offices
Award
2012 Award of Excellence in the Constructed Project from the United States Society on Dams
Award
American Public Works Association - 2012 Public Works Project of the Year over $75 million
Award
2011 Best Civil Works/Infrastructure Project in California by Engineering News-Record

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