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This is a multi-span example of a nationally uncommon truss type, with a variety of span designs. The bridge is unusual because it has a truss span at each end and a plate girder in the middle. The western truss span is wider than the eastern truss span, to allow for a slight curving of the track over the bridge at the western end. A truss span was clearly reused and widened through alteration for this part of the bridge. Evidence comes in the form of altered portal bracing, where it is apparant that steel was added to widen the original portal bracing. John Marvig provided research indicating that the girder span was added in 1913 when a flood destroyed the previous span at this portion of the bridge.
Thanks to Chicago NorthWestern Railroad's preference for lattice truss bridges, Wisconsin has a disproportionate number of remaining historic lattice truss bridges (sometimes called Warren Quadrangular trusses), which are on a national range somewhere between uncommon and rare. This is an excellent multi-span example. Apparently once a three-span bridge, the center span is now a through plate girder.
This bridge is one of three impressive railroad bridges that jump islands to cross the Wisconsin River at this location. Southeast of this bridge there is another two-span Lattice truss (Big Bull Falls Park and the east side of the river), and also a single span pony truss (Big Bull Falls Park and Stewart Island). All these bridges are historic.
Above: Aerial view. Photo Credit: Mark Boettcher
Above: Aerial view. Photo Credit: Mark Boettcher
This bridge is tagged with the following special condition(s): Unorganized Photos
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