I-5 Gateway

The I-5 Gateway Project was the final leg of the I-5 corridor that was widened through Orange County thanks to Measure M, the County’s half cent sales tax. This high profile project covered two miles north of SR-91 to the Artesia undercrossing at the Los Angeles County line. The project consisted of adding one High Occupancy Vehicle (HOV) lane and one general purpose lane in each direction, constructing auxiliary lanes and entrance and exit ramps, including the reconstruction of four bridge structures and one structure to be constructed high and lowered into position, as well as widening existing bridges over flood control channels, multiple retaining walls and sound walls. Challenges included a high water table, work in constrained right-of-way over an active freeway, avoiding impacts to local business and working within the adjacent UPRR rail corridor.

CALTROP provided construction management, surveying, constructability review, assistant resident engineering, structure representatives, office engineering, construction inspection, survey, scheduling, claims avoidance and public awareness services. Services included supporting OCTA and Caltrans District 12 in the delivery of the project through design, advertisement, award, administration, acceptance and post-construction aspects of the project.

2011 CTF Project of the Year
2011 ASCE Project of the Year
2011 OCEC Engineering Project of the Year Award
2010 CMAA Project of the Year Award

LOCATION: Buena Park, CA

CLIENT: Orange County Transportation Authority (OCTA) and Caltrans District 12
PROJECT VALUE: $335 million


  • Interchange Widening and Improvements
  • High Profile Project


  • Construction Management
  • Constructability Review
  • Inspection Services
  • Construction Services
  • Surveying
  • Public Outreach