The Fore River Bridge carries Route 3A over the Fore River between Quincy and Weymouth. The current lift bridge opened to traffic in 2017. It carries two 12-foot lanes each way along with a 5-foot bike lane and 9-foot sidewalk on both sides. The navigable clearance under the bridge is 250’ wide and 60’ vertical in the closed position.

The current (new) bridge is the third movable bridge at this location, it opened to traffic in 2017. The first bridge from 1902 was a swing bridge and it was replaced in 1936 by a bascule bridge. In the late 1990's the 1936 bridge was found to be badly deteriorated and in 2002, traffic was directed off it and onto a temporary steel lift bridge. In 2004, the 1936 span was demolished. The new permanent vertical lift bridge cost approximately $244 million to build and carries approximately 32,000 vehicles on the 3A corridor. It is expected to last at least 75 years.