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Historical Highlights: 100 Years of Zachry In 1996, Zachry was awarded a contract to build the 1.5-mile-long, 285-foot-high West Dam at the Diamond Valley Reservoir in Southern California – the largest earthmoving project in the United States at the time. The project team excavated more than 60 million cubic yards of earth for the approach channel and dam foundation, and 70 million cubic yards of rock for the dam embankment. The Reservoir, now known as Diamond Valley Lake, increased Southern California’s surface water storage capacity by more than 800,000 acre-feet. It can store up to a six-month emergency water supply and provides supplemental water during droughts and peak summer usage. #ZachryGroup #100YearsofZachry

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