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It is assumed that Patapsco Bridge and Iron Works of Baltimore, Maryland built this bridge, as that was the company that famous engineer Wendel Bollman of Baltimore, Maryland was running at the time this bridge was built.
This bridge was designed and built by Wendel Bollman, inventor of the Bollman truss configuration. This is not a Bollman truss however. Instead, it is a very old example of a pin-connected Pratt truss. As a pony truss, it has very small panels, giving this 67 foot span eight panels, a very large number of panels for a bridge of this size. The bridge no longer bears the weight of traffic, since steel stringers have been added between the deck and the floor beams to support traffic. The truss only supports its own weight. While preservationists with engineering interests likely would condemn this preservation project because the truss no longer bears any live load, preservationists who value integrity of original design and materials will find this to be a good compromise preservation solution. Because the stringers support the load, alteration or retrofit of the truss was not needed. The manner in which the stringers was added is sensitive. They are located above the floor beams, so they are not readily visible, and they have the appearance of oversized deck stringers, so they do not stick out even when seen. Also important is that the floorbeams or trusses were not altered. The stringers slip right in above the floorbeams without disturbing the truss.
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