SR-71/91 Interchange Flyover

The SR-71/91 Interchange is one of Southern California's busiest freeway junctions. Delivered in partnership with the Riverside County Transportation Commission (RCTC) and Caltrans, the project replaced an outdated loop connector with a new two-lane direct connector, added auxiliary lanes, and constructed two post-tensioned concrete box girder bridges totaling more than 3,500 feet.

Construction required some of the largest cast-in-drilled-hole (CIDH) piles installed in the region—up to 15 feet in diameter and over 100 feet deep—constructed in wet conditions adjacent to active freeway traffic, rail corridors, and the Santa Ana River. Improvements also included retaining walls, complex temporary shoring systems, drainage upgrades, and major utility relocations within a constrained right-of-way.

As RCTC’s representative in the field, FALCON, a CHA Company, provided comprehensive construction management and inspection services, overseeing constructability reviews, daily inspections, interagency coordination, and quality, cost, and schedule management. The team also reviewed CIDH work plans, critical lift plans, equipment loading analyses, spoil containment procedures, and inspection activities.

By identifying opportunities to merge construction stages and advance early work, FALCON helped reduce the overall construction schedule by approximately 6 months while maintaining traffic operations. The completed interchange improves mobility, reduces congestion, and enhances safety along a critical regional transportation corridor.