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Posted on: July 30, 2019

Groton Road (Route 40) Closure & Detour

Gilson Brook Rt40 Detour

MassDOT will be closing Groton Road (Route 40) to through traffic at Gilson Brook near the ACE Hardware plaza for a period of approximately five days while Contractors remove an existing culvert and install a new structure.  The road will be closed starting on Wednesday evening, July 31, 2019 at approximately 7:00 PM and will remain closed until the culvert is replaced.  Commuters are advised to seek alternate routes and to adjust travel times accordingly.

Construction materials and methods have been carefully selected to minimize the amount of time that the closure and detours will be in effect.  All businesses and residences in the area will be open and accessible at all times throughout the project.  Work is scheduled to be complete by Monday, August 5th.

The eastbound detour route begins at the intersection of Groton Road and Oak Hill Road and directs traffic down Oak Hill Road onto Nabnasset Street and then Main Street in Chelmsford back to Route 40.  The westbound detour is the same route in reverse.  Vehicles exiting Route 3 will be directed to Main Street or may travel directly to businesses on the east side of Gilson Brook.  Signs, message boards and directional arrows will be in place to mark the detour route in both directions.  A map of the detour is available online at 

For additional information about this project, please contact Paul Starratt, Town Engineer, at 978-360-0498, or

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