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Dorchester Avenue Bridge Replacement

A photo taken on top of the Dorchester Avenue bridge. A highway and train tracks are visible to the left, through a chain link fence.

We will begin construction in summer 2022 to prepare for the full replacement of the Dorchester Avenue Bridge in summer 2023. The steel bridge, which is located between Von Hillern and Kemp Streets, carries vehicles, pedestrians, and bicyclists over the Red Line, the Commuter Rail Old Colony Lines, and the Cabot Yard maintenance tracks.

Originally built in 1925 and last rehabilitated in 1975, the bridge will be replaced to protect its structural integrity and ensure reliable service.

  • Contract awarded: Fall 2021
  • Construction schedule: 
    • Part 1 – Summer 2022 – Full Bridge Closure
    • Part 2 – Summer 2023 – Full Bridge Closure
  • Project completion: Summer 2023
  • Budget: Estimated $34.5 million
  • Status: Preconstruction

Building a Better T

As part of our $9.6 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

What to Expect During Construction

Service impacts

Scheduled work will impact Red Line and Commuter Rail service on select weekends. 

Neighborhood impacts

The bridge will be completely closed to traffic during the summer 2022 work. It will be closed again during the bridge work planned for summer 2023.

During both seasonal work closures, we will set up vehicular, pedestrian, and bicycle detours. These will be in place throughout each construction season. We will post detour notices in advance of each closure, and will post signs along the detour route. 

Neighbors can expect increased construction noise from heavy equipment and machinery. We appreciate your patience and consideration while we work to complete this critical safety project.

This simple line map shows a surface street detour from Southampton St to to Boston St, which curves around and crosses Dorchester Ave, avoiding the area with the bridge under construction. The map also includes a heavy-vehicle detour, which begins and ends at the same places as the surface street detour, but gets on I-93 for the middle part of the detour.
This map includes a detour onto I-93 for heavy vehicle traffic, and a surface-road detour for local vehicle traffic—both will be in use during the 2022 and 2023 summer construction seasons
This map shows the pedestrian detour in green. It begins at Father Songin Way and Dorchester Avenue, turns left on Boston Street, and left again on Washburn Street, which curves around to Howell St. A left on Howell ends up at Dorchester Ave below the bridge closure. The Bike detour in gold starts at Southampton and Dorchester, then goes down Boston St to Bellflower St or Dorset Street, both of which meet up with Dorchester Avenue below the bridge.
These pedestrian and bike detour routes will be in use during the 2022 and 2023 summer construction seasons while the Dorchester Avenue Bridge is being repaired 

Learn more about the summer 2022 road closure

Recent Updates

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Contact Information

If you have any questions or would like to sign up for project updates, please contact DotAveBridge@mbta.com.

Past Events

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Building a Better T

As part of our $9.6 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

Recent Updates

View all project updates