BH Photo #192488
There is actually a small waterfall there J.P. Not sure if it is natural or possibly a man-made dam from an old mill site.
You can see it on the satellite view.
I might be seeing things, but looking at photo four it looks as if the river is being held back from the collapsed span. But the water looks like its higher under the closest span and after you get past the stone pier it seems it drops off, like a artificial dam is there.
It appears in photo #4 that the center span collapsed for some reason. There is no equipment around to indicate a planned removal, and likely this picture was taken after the calamity occurred. I believe this structure was replaced with a concrete arch bridge, but am not sure of the date.
This bridge featured some very interesting portals with unusually shaped finials. The Morse Bridge Company comes to mind with this type of portal, although P.E. Lane and a few other firms occasionally used this pediment shape. The triangular-shaped plaque at the top resembles one from the Wisconsin Bridge & Iron Works.