Photo taken by Patrick Feller
License: Creative Commons Attribution (CC BY)
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BH Photo #289204
Unfortunately I've yet to find an image of the bridge, but https://www.newspapers.com/newspage/10460384/ shows that the bridge was closed due to a failing pier.
HistoricAerials has amazing aerial views of the long-lost truss.
There remains compelling evidence for a railroad origin for the bridge supports still visible. Among that evidence:
While the structure of the riveted piers might support the argument for a bridge preceding the FM road, concrete rubble near the southwest bank supports the argument for a road.
It wouldn't be the first time that a bridge (or at least its substructure) had served two purposes over time.