WCC I-405 / I-605 Interchange

The project involved widening the existing interchange and constructing direct High Occupancy Vehicle (HOV) transitway structures to allow for continuous movement of carpool vehicles connecting from one freeway to another.

CALTROP provided construction management and inspection services for the OCTA / Caltrans District 12 I-405 / SR-22 / I-605 West County Connectors – West Segment project in the cities of Long Beach, Seal Beach, Westminster and the community of Rossmoor.

2013 WTS-OC Innovatve Transportan on Solutions Award
2015 ACEC Project of the Year
2015 CTF Project of the Year Award

LOCATION: Seal Beach, CA
CLIENT: Orange County Transportation Authority (OCTA)
PROJECT VALUE: $160 million


  • Interchange Widening
  • Direct HOV Transitway Structures Construction
  • Continuous Movement and Traffic Flow


  • Contract Administration
  • Roadway and Structural Inspection
  • Scheduling and Project Controls
  • Claims Avoidance and Resolution
  • Materials Testing
  • Surveying