A major commuter route, I-880 is the most heavily used corridor in the Bay Area for moving goods. It also connects the Port of Oakland with Silicon Valley. High traffic, bad geometry and interchange spacing as well as short weaving distances contributed to deficient traffic flow and high accident rates.

To improve movement, the project team executed a five-stage plan that included ramp and intersection modifications and reconstruction, overcrossing structure replacements, a new soundwall and redirection of regional traffic out of the neighborhood.

Relocating utilities was a challenge because the area hadn’t undergone major construction in many years and utility companies did not have comprehensive records. The project team coordinated with various utilities to compile documentation, hold dedicated utility meetings and complete extensive potholing during design.

The team also dealt with poor soil conditions. That led to the innovative use of expanded polystyrene blocks as fill for the abutment structures. The strong, lightweight solution allowed construction to proceed without waiting for soils to settle. Crews also added wick drains, which accelerate consolidation of soil. Those solutions shaved nearly 12 months off the schedule.

Back to ENR California's 2020 Regional Best Project Shine