A key bridge that links Dorchester and South Boston will close for the summer on Monday, June 13, as work begins to replace the nearly 100-year-old span that last saw major fixes in 1975.

The bridge, owned by the MBTA, carries vehicles, pedestrians, and cyclists over the Red Line and commuter rail line below. The $34.5 million project — which will also require a full closure in the summer of 2023— involves a full replacement of the bridge and the RedLine tunnel roof and the rehabilitation of a retaining wall on adjacent Von Hillern Street.

The bridge is scheduled to be closed through Aug. 31, with work primarily set for daytime Monday through Friday. The schedule will also impact Red Line and Commuter Rail service on select weekends, according to the T.

According to a statement on a project page maintained by the T: “Neighbors can expect increased noise from construction activity, including heavy equipment and machinery.”

Go to MBTA.com/DotAveBridge for more details.

Editor's Note: The original start date for this project was Monday, June 6. On Friday, June 3, that was revised to Mon., June 13, per an MBTA spokesman.