Route 4 Bridge

HEB was engaged by the New Hampshire Department of Transportation to design the rehabilitation of a 130-foot, 3-span continuous steel-stringer and concrete-deck bridge which was originally constructed in the early 1950s and was near the end of its useful life. Significant deck spalling had occurred, and road de-icer salt had affected the steel stringers at joints and bearings. Concrete bridge seats were also deteriorated. HEB designed a rehabilitation which included repair of the bridge seats, steel stringers, new bearings, new super-elevated concrete deck and new bridge and approach rails. Traffic was maintained on Route 4 during construction by rehabilitating one half of the bridge at a time.