NV5 - I-80 at SR-89 Roundabout California

I-80 at SR-89 Roundabout

NV5 provided geotechnical engineering and materials testing services for the Town of Truckee and Caltrans on one of the state’s first two-lane roundabouts at the intersection of Interstate 80 and State Route 89.

To accommodate the proposed widening of State Route 89, a portion of the east and west freeway abutments were to be removed for the building of retaining walls. NV5 evaluated lateral resistance and vertical capacity of existing driven piles supporting the I-80 over-crossing. The project was built on a fast-track path and was substantially completed in one season with minimum traffic disruption during the peak visitor season.

Our Caltrans certified inspectors provided compaction testing during underground utility development, laboratory testing, and concrete and asphalt concrete sampling and testing. We also analyzed existing driven piles for stability issues.


Truckee, CA


Town of Truckee; Caltrans