Berry Street Bridge Replacement

Built in 1919, the Berry Street Bridge over the Napa River was a 60-foot long, 30-foot wide, two-span reinforced concrete T-beam structure with masonry abutments and a reinforced concrete pier wall in the river. The existing bridge had cracks in the abutment walls and deck, vulnerability to scour, load restrictions, narrow traffic lanes and sidewalks. Caltrans gave the bridge a structural deficiency rating of 23.1, and its 10-foot-wide lanes made it functionally obsolete.

Mark Thomas designed and provided construction management for the HBP-funded replacement. The new bridge accommodates two 12-foot lanes, two 8-foot shoulders/bike lanes and two 5-foot sidewalks. The new structure is approximately 80-foot-long single span bridge. This allowed the new abutments to be farther up the bank of the river and help the hydraulic conveyance at the bridge. Removal of the center pier in the river also improved the hydraulics and eliminate the concern of scour at this location.

The new structure is a precast prestressed voided slab structure to have the shallowest deck profile possible and avoid conflicts with the 100-year water surface elevation. During construction, vehicular traffic was detoured around the project site and a temporary pedestrian bridge provided access to the school, church, and residences.