This bridge is an exceedingly rare and highly significant example of a truss bridge with Phoenix columns, a unique type of built-up beam invented, patented, and produced by the Phoenix Iron Company. Bridges containing them were usually built by the Phoenix Bridge Company of Phoenixville, Pennsylvania or Dean and Westbrook of New York, New York. Also, most of the small number of surviving Phoenix column bridges are in the northeastern United States. Surviving examples in the western United States are exceptionally rare. However neighboring Sonoma County has two similar bridges. Those two bridges and this bridge all have been relocated from a previous site at around the same time and all three have the same span length and as such they likely have a shared history, perhaps having one been part of a multi-span bridge.
This bridge has a National Bridge Inventory date of 1940, which likely refers to the relocation date. The bridge rests on steel i-beam bents, but the southern end of the truss also has riveted steel caissons as part of the substructure system. Riveted steel plate caissons with concrete inside were used on many early 20th Century bridges. However, the metal casing for these caissons have holes and handles on them which makes it look like they may in reality be salvaged parts from a boiler or something similar.
Overall the bridge has excellent historic integrity, and the trusses remain in good structural condition as well.
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CarCam: Approaching Roadway and Bridge Crossing
Full Motion Video
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