East Cambridge (Lechmere) Viaduct

Project Overview:

Work consists of repair and rehabilitation of the East Cambridge Viaduct carrying the MBTA Green line from Science Park Station to Charlestown Avenue in Boston and Cambridge, MA. The viaduct carries 2 (inbound and outbound) MBTA Green Line tracks, and includes 12 spans over Nashua Street, the Charles River, Museum Way and Charlestown Avenue. Work includes replacement of the bridge superstructure and safety walks; repair and rehabilitation of the concrete floorbeams, arches piers, and ductbanks; strengthening the arch spans with Carbon Fiber Reinforced Polymer (CFRP) fiber wrap; steel strengthening and repairs of the Bascule Span over the Charles River; Overhead Catenary System (OCS) replacement; traction power conduit and cable replacement, reconstruction of direct fixation track (DFT) over the viaduct reusing the existing rail, guard rail, and OTM with replacement of all bridge timbers; and signal replacement.