Metro-North Railroad – Superstructure Replacement of Bridge over Croton River, Croton-on Hudson, New York

Construction Supervision and Inspection Services, for Superstructure Replacement of bridge HU 32.81 Track # 4 over Croton River in Croton Harmon Yard, Croton-On-Hudson, NY

JED Engineering was retained as a Sub-consultant to provide inspection services for this major Metro North project. This project provides for the replacement of the existing superstructure at the four span single track railroad bridge carrying Track 4 over the Croton River at Hudson Line Milepost 32.81

Bridge HU 32.81 spans the mouth of the Croton River at Croton Bay.  The areas surrounding the bridge are tidal wetlands due to the effect of the Hudson River.  At this location there are three separate and independent structures that share the common support at the abutments and three river piers.  The easternmost and westernmost of these three structures are steel through girder superstructures and the center structure is steel through truss.  The westernmost of these three structures carries Track 4 of Metro North’s Hudson Line which provides commuter rail service between Grand Central Terminal and Poughkeepsie, NY.

The westernmost structure carrying Track 4 to be replaced is a simply supported, four-span, steel riveted through girder superstructure originally constructed circa 1908.  Each span is approximately 10 feet long for a total length of approximately 400 feet.  The through girders are riveted built up steel girders and are similar for all four spans.  Girders are 120” deep web plates with double angles at top and bottom, multiple top and bottom cover plates, double angle web stiffeners and built up knee braces. Transverse steel floor beams support longitudinal stringers which support an open deck consisting of wooden ties and steel rails.  The through girders are supported on rocker bearings at concrete abutments and piers which were rehabilitated in 1993.  A feature of this project was the removal and installation of the superstructure by use of cranes on barges.

Construction Cost: $4.36 million

Status: Completed Dec 2013