The official Diamond Valley Lake web site

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Work Force

At its peak in 1997 and 1998, the reservoir construction project employed an average of 1,800 people. At times, more than 1,900 people labored in building the reservoir’s three dams. From start to finish, about 5,000 people were employed by the construction project.

Big Trucks

Some of the biggest trucks in the world were used to build Diamond Valley Lake. Twelve Caterpillar 789 Model trucks were used in construction of the East Dam. When full of rock, trucks weighed 350 tons. They cost $1.4 million each. Their 1,800-horsepower engines burned 40 gallons of fuel per hour. They were so big they could not be driven legally on public streets. They were brought to the reservoir in pieces, assembled on site and then disassembled before being hauled away in trucks.