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Commonwealth Avenue Bridge Replacement

Construction crew works on the Commonwealth Ave Bridge replacment in the summer of 2017.
Updated on July 13, 2018

About the Project

Timeline: July 26-Aug 11
Status: Design

This summer, MassDOT will begin construction to replace the westbound side of the Commonwealth Ave Bridge. This is a continuation of work performed during the summer of 2017 that replaced the eastbound section of the bridge.

To complete this work, the Commonwealth Ave Bridge will be closed Thursday, July 26, 2018 at 7 PM to Saturday, August 11, 2018 at 5 AM. Due to the shared infrastructure between the 2 bridges, The Boston University (BU) Bridge will also be closed during this time.


How will the bridge's shutdown affect my trip?

There are planned service diversions and bus shuttles during this work.

Please plan ahead for your commute. Parking lots may reach capacity faster than usual, and travel times may be longer due to increased ridership on alternate routes.

Sign up for T-Alerts

Green Line B Branch

Bus shuttles replace trains between Blandford St and Babcock St, traveling in a loop.

View larger diagram

Bus shuttles replace trains between Blandford St and Babcock St July 27, 5 AM – August 11, 5 AM.

Bus shuttles will not collect fares, and you will not be charged to transfer back to the Green Line. Follow posted signage to the nearest bus shuttle stop.

Check Green Line B alerts


Route 57

Route 57 will operate its normal route but will skip these outbound stops:

  • Commonwealth Ave @ University Rd
  • Commonwealth Ave @ Buick St

Check Route 57 alerts


Route 47

The BU Bridge will be closed to all motorized vehicle traffic during the Commonwealth Ave Bridge Replacement.

Route 47 will omit the BU Bridge to detour via:

  • Memorial Drive
  • Massachusetts Ave Bridge
  • Kenmore Square
  • Putnam Ave

During the detour, a temporary stop will be added at Waverly Street at Brookline Street in Cambridge.

Route 47 Closed Stops

Inbound
  • Magazine St @ Chestnut St
  • Magazine St @ Riverside Rd
  • Granite St @ Pearl St
  • Mountfort St @ Lenox St
  • Park Dr @ Beacon St
Outbound
  • Park Dr @ Beacon St
  • Park Dr @ Mountfort St
  • Mountfort St @ Carlton St
  • Commonwealth Ave @ University Rd

Check Route 47 alerts


Route CT2

Route CT2 will omit MIT’s West Campus to detour via:

  • Massachusetts Ave Bridge
  • Kenmore Square

CT2 Closed Stops

Inbound
  • Amesbury St @ Vassar St
  • Mountfort St @ Lenox St
  • Park Dr @ Beacon St
Outbound
  • Park Dr @ Beacon St
  • Park Dr @ Mountfort St
  • Mountfort St @ Carlton St
  • Commonwealth Ave @ University Rd
  • Amesbury St @ Vassar St
  • Amesbury St @ Vassar St

Check Route CT2 alerts


Framingham/Worcester Line

Friday, July 27 and Friday, August 3

After 11 PM, free bus shuttles will replace inbound and outbound train service at Wellesley Farms, Back Bay, and South Station. Shuttles will also replace inbound service at Boston Landing.

Shuttle service will not be provided at Auburndale, West Newton, Newtonville, Yawkey and outbound service at Boston Landing. Please use nearby connecting service or consider an alternate route. We apologize for the inconvenience.

Weekends, July 28 – 29 and August 4 – 5

Related to ongoing Positive Train Control work, bus shuttles will replace train service during these 2 weekends.

See modified service

Check Framingham/Worcester Line alerts


Alternative Travel

The Commonwealth Ave and BU Bridges will both remain open to pedestrian and bicycle traffic during construction.

Walk

The shuttled section of the Green Line B Branch between Babcock Street and Blandford Street is approximately one mile long, so intermediate stops are within walking distance.

Bike

BlueBikes, a regional bike share program, has a number of stations near the construction area. During construction, you can rent a bike for the discounted rate of $1.00 (instead of $2.50) for a single trip.

Learn about BlueBikes


Additional Resources

Learn more about MassDOT's Commonwealth Avenue Bridge Replacement Project