This excellent and rare multi-span pony truss built by the noteworthy Groton Bridge Company, and its trusses were converted to decorative, a compromise preservation solution that has been nicely implemented here. Turning a truss bridge into non-structural elements of a replacement bridge is a way to retain a historic truss while avoiding unsightly alterations needed to bring it up to legal load limits, and with pony truss bridges it also allows for the deck to be widened without alterations to the truss lines themselves. There are both good and bay ways to approach this type of alteration to a historic truss, this one presents a couple best practices including avoiding encasement of the trusses in concrete, and "stubbing" the floorbeams into the steel stringers (rather than removing the floorbeams completely) which in this case was critical because the floorbeams were historically signifciant built-up fishbelly floorbeams and this is still apparant given the stubbing process.
Note that the railings, although attractive, were not original to the truss bridge. The loss of original sidewalk railings is the only major unfortunate loss on the bridge.
The bridge is located in a National Register Historic District, likely accounting for the trusses being spared a visit to the dumpster.
Please note that the dimensions given are for the truss bridge prior to alteration. Please download the National Bridge Inventory sheet which includes both the pre and post alteration sheets (and associated dimensions), although note the pre-alteration NBI sheet shows the bridge as four spans, perhaps indicative that the bridge had added supports prior to the alteration project.
Above: Photo from National Register Nomination showing the bridge prior to alteration.
This bridge is tagged with the following special condition(s): Unorganized Photos
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