Longfellow Bridge Design-Build Rehabilitation

The rehabilitation and restoration was performed in stages while maintaining the MBTA Red Line Rapid Transit Service and southbound vehicular traffic. Pedestrian and bicycle traffic was maintained in northbound and southbound directions on the existing structure during construction. The bridge structure including the MBTA reservation was reconstructed using replicated steel spandrel columns, floor beams and stringers assembled using high strength steel bolts similar in appearance to rivets of the original construction. The addition of reinforced concrete within the granite piers and towers of the substructures seismically reinforced the masonry abutments and piers. Each granite block was anchored to the internal reinforced concrete to insure any seismic forces are transferred to the supporting pile caps.

This historic 11-span open spandrel steel arch structure with two steel stringer approach spans and is founded on timber pile supported concrete and masonry abutments and piers.