Rehabilitation of the East Cambridge Viaduct over Nashua Street near the intersection with Charles River Dam Road will cause partial traffic lane closings on roads around Leverett Circle starting Wednesday, going as needed Sundays through Fridays from 9 p.m. to 5 a.m., state transportation officials said Friday.Overnight work with lane closings will continue on a regular basis through December, they said, though the schedule is subject to change.

The East Cambridge Viaduct carries green line trains from Lechmere across the Charles River into downtown Boston. The bridge was closed in May to allow the MBTA to rehabilitate and replace track on the historic, concrete arched structure. The upgrades will allow more trains to pass over the bridge, ultimately serving a relocated Lechmere Station and the others built as part of the Green Line Extension. The rehabilitated Viaduct will carry green line trains in 2021, the transportation officials said.

A lane on Nashua Street will remain open at all times, and bicycle access, the officials said in an email.