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Lake Isabella Dam Safety Improvements Project (DSMP)

Lake Isabella Dam Safety Improvements Project (DSMP)

Contract Value: $242M
Construction includes excavating a new emergency spillway, modifications to the existing service spillway, a 16-ft raise of the main dam and auxiliary dam, modifications to California State Route 155 at the main dam’s right abutment, and modifications at several recreation facilities north of the auxiliary dam. The essential features of the contract work include excavation of 2.95 million CY of earth and rock for a new emergency spillway; construction of a 28-ft-tall, 56,000 CY structural concrete Labyrinth Weir; buttressing and raising the existing dam structures by 16 ft; improvement and enhancements of the dam foundation; processing and placement of more than 2.3 million CY of zoned fill embankment; modifications to CA State Route 155 to accommodate the increased dam height; and site work and improvements to several adjacent recreational facilities and roadways.