Thanks, Nathan. I see the original bottom chord now.
Robert,
Let me clarify the design of this bridge for you, which may not be apparent in the photo. What looks like a polygonal bottom chord is not the original bottom chord. The original bottom chord is horizontal and is above the added metal which likely was added during a floorbeam alteration. Additionally, the verticals on this bridge are back-to-back channels with v-lacing on each side. This was characteristic of Massillon ponies, but your bridge appears to have angles with lattice, uncommon among Massillon ponies.
Nathan: Thank you for updating this bridge, and therefore calling my attention to it. There is a nearly identical bridge in Riley County, Kansas. Perhaps that bridge was built by the same firm. I had always wondered who the fabricator might have been, and this might give me a clue.
Link for the Kansas example:
Another easy way to identify the bottom chord is to look where the diagonal members meet the verticals--they always meet at the top and bottom chords and never anywhere else, except in cases of subdivided panels (Pennsylvania, Baltimore, or subdivided Warren).