East Dam - Hemet, Calif.
East Dam is one of three dams constructed for the Metropolitan Water District of Southern California's Eastside Reservoir project. The reservoir doubles Southern California's surface storage capacity and provides a six-month emergency supply of water to nearly 16 million residents in the event of an earthquake or drought.
The 2.1-mi. East Dam, constructed by a joint venture led by Kiewit Pacific Co., a subsidiary of Kiewit Corporation, is the longest of the three dams. It measures 180-ft. high, 1,200-ft. wide at the base and 40-ft. wide at the top. Before embankment of the dam could begin, more than 18 million cu. yd. of alluvium had to be excavated to reach a solid bedrock foundation. The embankment required 43 million cu. yd. 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.
Kiewit Pacific Co.'s extensive equipment resources were a major factor in the project's success. More than 140 major pieces of equipment, including two 23-cu.-yd. front shovels, twelve 200-ton mining trucks and eighteen 120-cu.-yd. belly dump trucks, moved the nearly 73 million cu. yd. of material in 650 days.