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Longfellow Bridge Rehabilitation


Project Highlights:
  • 6,000,000 lbs Structural Steel
  • 25,000 cy Concrete
  • 5,500,000 lbs Reinforcing Steel
  • 200,000 sf Granite Restoration



This MassDOT Design-Build project is comprised of a historic eleven span open spandrel steel arch structure with two steel stringer approach spans and is founded on timber pile supported concrete and granite abutments and piers.

The rehabilitation and restoration was performed in stages while maintaining the MBTA Red Line Transit Service and southbound vehicular traffic. Pedestrian and bicycle traffic was also maintained in northbound and southbound directions on the existing structure during construction. Recreational and Commercial boating traffic was maintained on the Charles River below the Longfellow Bridge during all stages of construction.

The bridge structure including the MBTA reservation was reconstructed using replicated steel spandrel columns, floorbeams and stringers assembled using high strength steel bolts similar in appearance to rivets of the original construction. The masonry abutments and piers were seismically reinforced by the addition of reinforced concrete within the granite piers and towers of the substructures. Each granite block was anchored to the internal reinforced concrete to insure any seismic forces are transferred to the supporting pile caps.

Contract value: $305,550,000