A piece of Medford Street in Somerville will be closed off and on over coming days, according to the MBTA.
Blasting and painting the bridge that carries Medford Street over rail tracks near the intersection with McGrath Highway will close the street from July 1 to July 3, July 5, and July 6 to July 10. Widening the bridge is part of the first phase of the Green Line Extension project.
Southbound traffic will be diverted onto McGrath Highway to Cambridge Street in East Cambridge. Northbound, motorists will take a detour onto South Street, Windsor Street, Windsor Place, Webster Avenue, Prospect Street, then Somerville Avenue, which connects to McGrath Highway.