The 2.1-mile (3.4 km) long East Dam, constructed by a Kiewit-led joint venture, is the longest of the three dams.
It measures 1,200 feet (370 m) wide at the base and 40 feet (12 m) wide at the top.
Before embankment of the dam could begin, more than 18,000,000 cubic yards (14,000,000 m³) of alluvium had to be excavated to reach a solid bedrock foundation.

The embankment required 43,000,000 cubic yards (33,000,000 m³) of crushed rock.
An on-site crushing plant crushed and processed over 14 million tons of rock in 20 months to supply the dam's materials.
The cut-off wall, which consists of a 3 feet (0.91 m) thick plastic concrete mix constructed through the weathered portion of bedrock, varies in depth from 10 feet (3.0 m) to 110 feet (34 m) and totals 250,000 square feet (23,000 m²).
A two-line grout curtain reaches depths of 150 feet (46 m) below the foundation in the north segment of the East Dam and 100 feet (30 m) in the south segment.

Because of the amount of material used in the construction of the east dam, some of the biggest trucks in the world were used.
Twelve Caterpillar 789 dump trucks were used in construction of the East Dam.
The 2.1-mile (3.4 km) long East Dam, constructed by a Kiewit-led joint venture, is the longest of the three dams. It measures 1,200 feet (370 m) wide at the base and 40 feet (12 m) wide at the top. Before embankment of the dam could begin, more than 18,000,000 cubic yards (14,000,000 m³) of alluvium had to be excavated to reach a solid bedrock foundation.
The embankment required 43,000,000 cubic yards (33,000,000 m³) of crushed rock. An on-site crushing plant crushed and processed over 14 million tons of rock in 20 months to supply the dam's materials. The cut-off wall, which consists of a 3 feet (0.91 m) thick plastic concrete mix constructed through the weathered portion of bedrock, varies in depth from 10 feet (3.0 m) to 110 feet (34 m) and totals 250,000 square feet (23,000 m²). A two-line grout curtain reaches depths of 150 feet (46 m) below the foundation in the north segment of the East Dam and 100 feet (30 m) in the south segment.
Because of the amount of material used in the construction of the east dam, some of the biggest trucks in the world were used. Twelve Caterpillar 789 dump trucks were used in construction of the East Dam.
Diamond Valley Lake