Not every long drive to an unphotographed old bridge is a home run. But they all have some neat history.
Photo taken by Nick Schmiedeler in December 2016
BH Photo #371544
It looks like the deck and original flooring system were scrapped too, at least if this was originally a lattice girder--if it were to function as a true girder bridge, the bottom chord of the lattice should be below the deck, and there should be lateral floor beams to support the deck. The existing deck is much thicker than the original would have been, and the bottom chord is above the deck. My guess is this was done at the same time that the diagonals and center support were added.
The original design intent and historic significance is function as lattice girder. The added load-bearing bent is not original and is an alteration (probably a good thing given severe impact damage to girders).
I added "Lattice Pony Truss" category but from the looks of the support below and the truss in picture 4 it appears it functions as a beam bridge.
Similar to a Canton "Lattice Girder" in design, with exception to the ends not being rounded.
I'm not seeing a truss here. 1994 NBI shows stringer, I'd say slab or stringer.
What's the consensus?
Long drive for this one....sadly it is in serious need of some TLC. Regardless, obviously a very neat old survivor.