SR-22/I-405/I-605 West County Connector – Western Segment
A more seamless transition of I-405’s HOV lanes
Long Beach, California
California Department of Transportation
TRC Companies, Inc.
Roadways & Bridges
The California Department of Transportation (Caltrans) awarded Atkinson the $102 million contract for the SR-22/I-405/605 West County Connector Project – Western Segment. The project was a continuation of the previously awarded SR-22/I-405 West County Connector – Eastern Segment project.
Like the previous project, this five-mile-long project created a more seamless transition of I-405’s high-occupancy vehicle (HOV) lanes to I-605 and State Route 22 into Long Beach. Atkinson widened the outside lanes of I-405 to accommodate additional HOV lanes in both directions, provided new I-405/I-605 HOV direct connector ramps, and reconstructed the following four structures:
- Seal Beach Boulevard bridge crossing over I-405
- Eastbound SR-22 to the northbound I-405 connector
- Eastbound SR-22 to the northbound I-605 connector
- Northbound I-405 to the westbound SR-22 connector
The I-405/I-605 HOV direct connector bridge, measures 2,902 feet-long and sits 45 feet above I-405, which carries 415,000 cars daily. The HOV connector was constructed in the median of the freeway, and required 26’ high retaining walls. Traditional cantilever retaining walls could not be used due to their construction footprint, and MSE walls were prohibitive due to poor soil conditions. The designer used an innovative approach which incorporated lightweight fill and precast panels for the structure approach.
Atkinson utlized its self-perform capabilities to install 20,000 linear feet of drainage, 42,000 cubic yards of bridge concrete and 2,200 cubic yards of wall concrete, 40,000 cubic yards of concrete paving, and 356,000 cubic yards of roadway excavation.