Route 3 Bridge over Farm Road
The bridge was built in 1953 for the relocated U.S. Route 3, which the state laid out through Billerica in 1952 and 1953 as a four-lane divided highway with limited access, running from Route 128 in Burlington to the Lowell bypass in Chelmsford and bypassing the town centers. A short concrete bridge carried the highway over a farm road here, west of the Concord River, so that the farm land on both sides of the new road could still be reached. The road under the bridge is now Farm Road.
In the Route 3 North project, the state's first design-build highway contract, Modern Continental Construction widened Route 3 to three lanes each way between Route 128 and the New Hampshire line and replaced 40 bridges; the work was finished early in 2005. The farm road underpass was rebuilt as a steel bridge about 46 feet long in 2004, and the contractor made further repairs at the Farm Road underpass in 2004 and 2005.