I-405 Improvement Project

This project, OHLA USA’s largest U.S. contracts, features the fast-tracked design and construction of 16 miles of two new lanes in each direction of the interstate highway I-405 in Orange County, California, from Costa Mesa to Los Angeles County. The OHLA USA-led design-build joint venture performs this $1.4 billion assignment for the Orange County Transportation Authority and the California Department of Transportation.

The project team is adding a general-purpose lane in each direction of I-405 from Euclid Street to the I-405/I-605 interchange, along with other enhancements consisting of a tolled express lane in each direction from SR-73 TO SR-22, improvements to freeway entrances, exits, bridges, and several auxiliary lanes. Also included in the scope of work is the reconfiguration of interchanges and ramps, construction of 18 new or replacement crossroad/ramp bridges, two overhead railroad crossings, one pedestrian bridge, and seven bridge widenings. Utility relocation, pavement construction, drainage facility upgrades, and sound wall installation are also part of the contract.