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Accelerated Bridge Program Massachusetts Department of transporatation

About This Project


MassDOT is undertaking the Longfellow Bridge Rehabilitation Project, one of five major projects of the Commonwealth's $3 billion Accelerated Bridge Program. The historic bridge, with its iconic “salt and pepper” towers, is a vital link between Boston and Cambridge, making important regional connections and contributing to the Charles River Basin Historic District.

The project will address the bridge's current structural deficiencies, upgrade its structural capacity and bring it up to modern code, including improving multi-modal access and bridge-to-city-street connections to meet accessibility guidelines. The repairs and modifications will be consistent with the historic character of the bridge and comply with environmental standards.

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What's New

Upcoming Traffic Alerts

Visit the Traffic Information page for weekly updates on lane closures and details on other traffic management activities, including detour routes, during the current construction phase. View the Construction Updates section to learn more about current construction activities.

Construction Updates

Stage 4 and 6 Construction

Beginning August 26, all modes of transportation will use the upstream side of the Longfellow Bridge to accommodate the combined Stages 4  6 of construction. Under this combination plan, WSC will simultaneously rehabilitate the bridge under the MBTA outbound track (Stage 4) and reconstruct the downstream roadway and sidewalk (previously planned for Stage 6). With this modification, the contractor anticipates having all modes of travel in their final configuration by June 2018. Stage 5 will be performed after the combined Stages 4 & 6. View the Stage 4 & 6 Graphic for travel space configuration along the Longfellow Bridge.and

Travel Shift

To accommodate the combined construction phase, all modes of travel will use the upstream side of the bridge.

  • Inbound vehicles use the upstream roadway to cross the Longfellow Bridge. The crossover in Cambridge at the MBTA Red Line tunnel is closed and vehicles traveling inbound to Boston continue from Broadway and Third Street onto Main Street and straight across the bridge.
  • Inbound bicyclists have a new 5-foot wide designated bike lane on the upstream roadway.
  • Pedestrians use the upstream sidewalk for travel in both directions.
  • Stay Safe, Share The SpaceOutbound bicyclists share the upstream sidewalk with pedestrians. The new upstream sidewalk is 8 feet 9 inches wide and can accommodate one bike lane and pedestrians.
  • While outbound cyclists may ride their bikes on the sidewalk, MassDOT asks that cyclists and pedestrians use caution and respect the rights of everyone to use public infrastructure in this temporary shared configuration.
  • MBTA and emergency response access across the bridge will be maintained at all times.

Bike Travel at Boston Approach

When approaching Charles Circle from the Longfellow Bridge, inbound bikes will stop along with inbound cars at the traffic signal. From the Cambridge Street traffic signal, bikes may go straight across to continue on Cambridge Street or go right to Charles Street.

To access the Longfellow Bridge from Charles Circle, outbound bike will use the bike lane along Cambridge Street to turn left onto Charles Street, crossing under the MBTA Charles/MGH Station. Outbound bikes will then turn right after the traffic signal to cross onto the sidewalk on the upstream side of the bridge.

View the Boston Approach graphic for inbound and outbound bike routes around Charles Circle. Signs and road markings will guide cyclists along these routes. Cyclists should use caution, watch for pedestrians, and obey traffic signals in Charles Circle.

Bike Travel at Cambridge Approach

When approaching Kendall Square, outbound bikes will turn left and follow the existing sidewalk left towards Memorial Drive westbound. Outbound bikes will continue to share the sidewalk with pedestrians along Memorial Drive westbound to cross under the Longfellow Bridge. Cyclists will then turn left to merge onto the exit ramp for Main Street.

To access the Longfellow Bridge from Kendall Square, inbound bikes will use the bike lane along Main Street to continue straight onto the upstream roadway across the Longfellow Bridge. Inbound bikes will have a dedicated five foot wide bike lane next to the inbound vehicles travel lane on the upstream roadway.

View the Cambridge Approach graphic for inbound and outbound bike routes. Signs and road markings will guide cyclists along these routes. Cyclists should use caution and watch for pedestrians and turning vehicles.

Red Line Configuration

The construction of the temporary inbound Red Line track (called a "shoo-fly") on the roadway is complete. The inbound trains were shifted to the shoo-fly track and the outbound trains were shifted to the newly constructed, future inbound track in mid-July. The shift allows WSC to rehabilitate the bridge under the current location of the MBTA outbound tracks.

Pedestrian Bridge Construction

MassDOT began construction of the new pedestrian bridge connecting the Esplanade with Charles Circle in November 2015. Work started on the Esplanade side of Storrow Drive to the west of the existing bridge. WSC will construct the new bridge during daytime hours from 7:00 AM to 5:00 PM. Periodic lane closures on Storrow Drive will be necessary to protect public safety. Closures for materials delivery and to move equipment will be scheduled for off-peak travel times to minimize traffic impacts. Vibration monitors will be placed near structures closest to the construction and noise will be monitored as necessary. The old pedestrian bridge will remain in service until the new one is complete, which is scheduled for 2017. View the Pedestrian Bridge Construction advisory for more information.

 Contact Us
MassDOT is committed to public outreach throughout construction. An issues tracking system during construction ensures that problems and concerns are addressed in a timely manner.
To report issues or concerns or for questions related to construction, please use the dedicated project hotline, 617-519-9892, or email address, longfellowbridge@state.ma.us.
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