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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 bridge was rehabilitated and restored 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 original bridge archbeams were repaired and rehabilitated in place using steel plates, angles and high strength tension control bolts similar in appearance to rivets of the original construction. The granite abutments and piers were seismically reinforced by the addition of reinforced concrete within the vaults of the substructures. The internal reinforced concrete was connected to the supporting pile caps and masonry walls, and shall support the deck structure above.

                                                                                    Contract value: $305,550,000