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Posted on: July 19, 2021

MassDOT Nightwork on Route 495

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MassDOT Advisory: Chelmsford


Lane Closures on I-495 Northbound and Southbound between the Westford/Chelmsford Town Line to the Route 110 Interchange


Work will occur nightly between the hours of 8 p.m. and 5 a.m. beginning Sunday, July 18


For Immediate Release                                                                    

July 16, 2021

CHELMSFORD - The Massachusetts Department of Transportation (MassDOT) is announcing that it will be implementing nightly lane closures on Interstate 495 northbound and southbound between the Westford/Chelmsford town line and the Route 110 interchange in Chelmsford.  The closures will be implemented Sunday night through Friday morning 8:00 p.m. to 5:00 a.m. beginning Sunday, July 18. 


These traffic impacts are necessary to allow crews to safely perform pavement milling and resurfacing operations and associated work along this 3.4 mile section of I-495.  This contract was awarded to Aggregate Industries which also includes a section of I-93 in the Towns of Medford, Somerville and Stoneham with an estimated total cost of $5.7 million and a completion date of August 2023. 


Drivers who are traveling through the area should reduce speed and use caution.


Appropriate signage, law enforcement details, and advanced message boards will be in place to guide drivers through the work area.


For more information on traffic conditions, travelers are encouraged to:

  • Dial 511 and select a route to hear real-time conditions.
  • Visit, a website that provides real-time traffic and incident advisory information, and allows users to subscribe to text and email alerts for traffic conditions.
  • Follow MassDOT on Twitter @MassDOT to receive regular updates on road and traffic conditions.
  • Download MassDOT’s GoTime mobile app and view real-time traffic conditions before setting out on the road.



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