daily traffic volume in both directions of 36,027. The peak ADT over the Broadway Bridge was 42,555 vehicles in 1990. Between 2000 and 2014, the bridge opened for vessels 434 times. The bridge measures long, including approaches. The lift span is long and sits above mean high water in the "closed" position, though it can be raised to above mean high water. It weighs and is composed of two Warren trusses. The lift span is supported by the lift towers at each end, which rise above mean water. The lift span is suspended by two sets of 12 wire ropes at each corner. Each rope is wrapped around counterweights on each end: at the top of each tower and on the span. The span can be lifted by one electrical drive in each tower. The tops of the lift towers were tapered to be flush with the top of the lift span. The lower deck contains two roadways and sidewalks, one on each of the west and east sides. The roadways are each wide, carrying one direction of traffic on Broadway, and the sidewalks are each wide. A median divides the two roadways. In addition, there are of subway and electrical conduits along the bottom of the Harlem Ship Canal. The conduits had to be placed in a trench at the bottom of the canal because it was infeasible to place fixed conduits on the movable span. Previous spans The first span at the site, the Harlem Ship Canal Bridge, was a single-deck swing bridge. It measured from end to end, or excluding stone abutments. It was constructed with four sections supported by three masonry piers. The two central sections comprised the swing span, which pivoted around a small masonry island in the middle of the canal. On either side of the masonry island were navigable openings that measured wide at mean high water. The swing span was flanked by two approach structures, as well as stone abutments. It was operated by steam engines. The bridge had a total width of , with a roadway of and two sidewalks of . The bridge weighed , with the machinery comprising one-sixth of the weight. The second span, the 225th Street Bridge, was a double-deck swing bridge. The upper deck carried the subway tracks while the lower deck carried a road, two sidewalks, and the Metropolitan Street Railway's streetcar tracks. There was