State Route 4 / Balfour Road Interchange

This new $40 million interchange removed the last at-grade intersection between Brentwood and Walnut Creek, enhancing movement of vehicles and eliminating an intersection with a high accident rate.

The project included significant revisions to State Route 4, three new bridges, protection of a critical water main, extensive utility relocation, drainage structures, a box culvert extension, new and temporary signalized intersections, and improvements to Balfour Road.

Psomas services started with a constructability review of the 90% plans and continued with full construction management services for the entire project.