McLaren Engineering Group engineered the replacement of Monroe Street Bridge in Norwalk, CT, upgrading the superstructure and piers and improving the existing roadway’s vertical clearance. The Monroe Street Bridge is a three-span overpass supporting four New Haven mainline rail tracks and two side tracks, which services a Metro-North line. The bridge is supported by stone masonry abutments and built-up steel piers.
As the prime engineering consultant on this project, McLaren was responsible for the complete reconstruction design of the bridge. The design was complex because of the superstructure’s height limitation. McLaren’s team designed the replacement of a three-span structure with a 72-foot single-span steel structure. An elaborate construction staging scheme was designed to keep three main tracks in operation at all times. McLaren’s reconstruction design scheme took place in multiple stages to minimize the impact on railroad traffic.