Triboro Bridge: Fixed Truss Span
Perhaps the least glamorous part of the Triboro Bridge is the truss section connecting the Bronx with the main interchange on Randalls Island. The main span over Bronx Kill is a 383-foot-long subdivided Warren Truss span with a clearance above mean high water of 55 feet. The approach truss spans are 1,217 feet giving a total anchorage-to-anchorage length of 1,600 feet.
At the time of construction, Bronx Kill was not navigable and the Corps of Engineers permitted use of a fixed span with the proviso that it be built in a way that would permit conversion to a lift span at a later time. Subsequently much of Bronx Kill has been filled in to expand parkland, leaving the tidal estuary little more than a shallow canal. The Kill can be navigated by canoe between the Harlem River on the west and East River on the east at high tide.