I-405 Sepulveda Pass Widening

Los Angeles, California

This design-build project involved constructing one 10-mile HOV lane northbound on I-405 from the I-10 to US-101. The work also included adding 10-foot shoulders, restriping all lanes to standard 12-foot widths, realigning existing on-and-off-ramps, reconstructing or modifying 23 bridge and ramp structures, building approximately 18 miles of retaining walls, and performing road improvements on the adjacent city streets. Several modifications to the southbound lanes resulted in restriping to standard lane widths. Over 300 electroliers were installed along with 18 traffic signals. Systems work includes fiber-optic communications, CCTV systems, ramp metering, vehicle detection, and fully-adjustable changeable message signs to communicate travel times.

Kiewit oversaw the demolition of the Mulholland Bridge, coined by the media as “Carmageddon” for its potential impacts to Los Angeles’ heavily congested traffic corridor. The demolition was completed 17 hours ahead of schedule.