Possibly 1910s-1920s? It’s difficult to tell, but the size of the girders and the concrete piers seem to suggest at least a range around that time period.
Getting to this thing was a scary drive through flooded roads, and upon arrival tried even harder to get on the bridge to look for a plaque potentially on other side in full, sweaty body-cover bug-proof regalia, but to no avail, forest of vines, trees, every form of vegetation...neat one though, huge girder on abandoned line - guess on date?
Cool, thanks John