A key bridge on Dorchester Avenue that carries motorists, cyclists, and pedestrians over the Southeast Expressway and MBTA tracks will be demolished beginning this weekend, according to T officials. The span, which links Dorchester and South Boston, has been closed since 2022 as repair work went on to a Red Line tunnel roof and an adjacent retaining wall on Von Hillern Street.

Now, demolition work will take place on the bridge itself over the next three weekends: March 23-24, March 30-31, and April 6-7. It is scheduled to be replaced with a new bridge with work slated to “begin in spring 2024,” according to a T statement. The project carries an estimated cost of $34.5 million. It’s the most extensive repair project to the bridge since it was built in 1925. It was last rehabilitated in 1975.

“Neighbors should expect increased construction noise from heavy equipment and machinery,” the agency said in a press release.

Red Line train service will be suspended between Broadway and Ashmont – and North Quincy – for all three weekends. When it does re-open to people and traffic later this year, T officials say, the topside will "appear very similar to the existing bridge before the roadway closure began."

Go to MBTA.com/DotAveBridge for more details.