H&H conducted an engineering Feasibility and Economic Analysis Study to evaluate the options for the rehabilitation/replacement of the Railroad Bridge over Norwalk River. The report included the analysis and preliminary engineering for the rehabilitation and replacement alternatives, the constructability review for the presented options, and the construction cost and life cycle cost comparisons.
Based on this study, ConnDOT decided to replace the bridge. The project will use the Construction Manager at-Risk (CMR) project delivery method. H&H’s role during this stage will be to assist ConnDOT as the owner’s rep, providing peer reviews of the design submissions and a constructability review to examine the construction phasing, maintenance and protection of railroad operations, construction access, operational and safety concerns, and the need for temporary construction. H&H will also assist the department with cost estimating and scheduling.
The bridge, known as the WALK Bridge, was built in 1896 as part of the New York, New Haven Railroad’s massive re-building of its main line to double the capacity. The bridge consists of a 200-foot-long, rim-bearing swing span and three approach truss spans for a total length of 564 feet. The swing span and the approach spans are all double-intersection Warren deck trusses, a standard type of old railroad construction, where a great deal of strength was required. The four-track bridge carries Amtrak, Metro-North and freight trains over the Norwalk River.