How the Commonwealth Avenue Bridge construction will impact your commute this summer

"There will be significant service impacts to all modes of transportation," according to MassDOT.

Boston, MA - 7/10/17 - The Commonwealth Avenue Bridge, which is slated for replacement, photographed on Monday, July 10, 2017. The bridge is scheduled for a two month closure which will cause severe delays, the Mass. Department of Transportation has warned. (Nicholas Pfosi for The Boston Globe)
The Commonwealth Avenue Bridge. –Nicholas Pfosi for The Boston Globe

For a little over two weeks this summer, the Massachusetts Department of Transportation will replace the westbound side of the Commonwealth Avenue Bridge.

The work, described by MassDOT as “intensive construction operations,” is scheduled to run from Thursday, July 26, through Saturday, August 11. Last summer, MassDOT demolished and replaced the eastbound side of the bridge as well as the MBTA’s Green Line infrastructure. 

This year’s construction will cause “… significant service impacts to all modes of transportation in the Boston University/Saint Paul Street neighborhood of Boston along Commonwealth Avenue, including MBTA, commuter rail and Amtrak customers, vehicles along Commonwealth Avenue and the Boston University Bridge, and traffic on I-90,” MassDOT officials said in a news release.

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Here’s what the construction project means for commuters, drivers, bicyclists, pedestrians, and everyone else:

For pedestrians and bicyclists:

Pedestrians and bicyclists will be able to access the bridge’s eastbound side during construction, according to MassDOT.

For drivers:

MassDOT has broken down the project’s impact on drivers by the affected roadways, which are as follows:

Commonwealth Avenue: Commonwealth Avenue between Packard’s Corner and Kenmore Square will be closed to vehicular through-traffic from 7 p.m. on July 26 to 5 a.m. on August 11. Access through this area will be maintained for local businesses and customers, residents, MBTA buses, emergency services, pedestrians, and bicyclists.

Boston University Bridge: The BU Bridge will be closed to vehicular and bus traffic from 7 p.m. on July 26 to 5 a.m. on August 11. Access will be maintained for pedestrians and bicyclists only.

Massachusetts Turnpike: MassDOT will conduct a “dry run” of the I-90 traffic logistics from June 1-3. I-90 eastbound and westbound will be reduced to two lanes in each direction between the Allston Interchange and the Beacon Street Overpass from 9 p.m. on June 1 to 5 a.m. on June 3. The I-90 eastbound on-ramp from Cambridge Street/Soldiers Field Road will be closed during this entire period. The I-90 westbound Exit 20 off-ramp to Brighton/Cambridge will be intermittently closed.

From 9 p.m. on July 27 to 5 a.m. on August 6, I-90 between the Allston Interchange and the Beacon Street Overpass in Boston will have no more than two lanes open in each direction during peak hours. I-90 in this area will be further reduced to one lane in each direction at various times during off-peak, weekend, and weekday overnight hours.

The I-90 eastbound on-ramp from Cambridge Street/Soldiers Field Road will be closed during this entire period.

The I-90 westbound Exit 20 off-ramp to Brighton/Cambridge will be closed intermittently.

I-90 will fully restored to four lanes in both directions at 5 a.m. on August 6.

Memorial Drive: MassDOT has requested that the Department of Conservation and Recreation allow vehicular traffic on Memorial Drive in Cambridge on Sunday, July 29, and Sunday, August 5, in order to minimize impacts on local roadways.

For public transportation:

MBTA Green Line: The B Line will be replaced with shuttle buses between the Babcock Street and Blandford Street stations from 5 a.m. on July 27 to 5 a.m. on August 11.

Commuter Rail: The Framingham/Worcester Line will operate regular service on weekdays. On the weekends of July 28-29 and August 4-5, shuttles will replace Commuter Rail service in this area. Details regarding these diversions are being finalized, according to MassDOT.

MBTA buses: MBTA bus routes CT2 and 47 will be detoured from their normal routes from 7 p.m. on July 26 to 5 a.m. on August 11. The Route 57 bus will operate its normal route but will not make outbound stops in the construction area.

Amtrak: Amtrak’s Lakeshore Limited Line will be replaced by shuttle buses between South Station and Albany, New York, for the weekends of July 28-29 and August 4-5.

How to get updates:

MassDOT encourages affected commuters to get updates from mass511.com or the department’s GoTime travel app. More information is also available on MassDOT’s traffic management page.