Northern Avenue Bridge, Railway bridge in Boston, United States

The Northern Avenue Bridge is a steel swing bridge over the Fort Point Channel in Boston, built 1905–1908 to a design by city engineer William Jackson. Its total length is about 640 feet (200 m), with a movable center section of roughly 285 feet (87 m) that pivots to let water traffic pass. The center truss span carried a single track of the Union Freight Railroad, though it was built for two.

Designed by Boston city engineer William Jackson, the swing bridge was built from 1905 to 1908 and opened on October 24, 1908. Its center span carried a single track of the Union Freight Railroad, though it was designed for two. From 1912 to 1948 a firehouse on piers beside the bridge housed Fireboat Engine Company 44; the abandoned structure collapsed into the harbor in 1968.

Locals call it the Old Northern Avenue Bridge, since its successor was briefly the New Northern Avenue Bridge before being named the Evelyn Moakley Bridge. From 1912 to 1948 a firehouse on piers stood beside it, housing Fireboat Engine Company 44; the abandoned building collapsed into the harbor in 1968.

The bridge is not open to general traffic as it has been closed since 2014 due to structural safety concerns. Plans are underway to redesign it as a pedestrian and cycling crossing.

From 1912 to 1948 a firehouse built on piers stood against the bridge, housing Fireboat Engine Company 44; the company moved to the North End in October 1948 and the abandoned firehouse collapsed into the harbor in 1968.