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Medford St. Bridge to Close Friday, May 17, 2019, Through Spring 2020

The Medford St. bridge, in Gilman Square behind Somerville High School (SHS), will close for construction starting Friday, May 17. It’s expected to remain closed through the spring of 2020. 

For the duration of this closure, all traffic will be detoured around the work zone via Pearl St. and McGrath Highway. Detour maps and directions are available on in the Bridge Closures section.

Recent schedules had projected the Medford St. bridge would close in July 2019 for Green Line Extension (GLX) construction, but this new timeline was established after careful coordination between the Green Line Extension project and the Somerville High School Building project, which are progressing in close physical proximity to one another.

Advancing the Medford St. bridge closure by six weeks will provide critical logistical benefits for both projects. Following work by the SHS project this spring and summer, GLX will modify the bridge, creating a longer span with structural improvements to accommodate new Green Line tracks.

To stay informed about construction, sign up to receive a weekly email outlining upcoming construction citywide at Residents are also encouraged to enroll in the City’s alert system at to ensure they’re notified prior to major detours or disruptive construction activity in their neighborhood.

Anyone seeking assistance for an urgent Green Line construction-related matter should call the 24/7 GLX hotline at 1-855-GLX-INFO (459-4636) or email

For additional information about the Green Line Extension project, including construction schedules, fact sheets, and the latest station designs, visit

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