I think I have the problem solved. This bridge was a Pratt half-hip pony truss bridge with pinned connections built in 1901 by the New Columbus Bridge Company of Columbus, OH. This according to a bridge survey conducted by Fraser Design in the 1990s. In either case, it's really sad that the bridge is gone by the floods.
Pratt, Parker, either way it just underscores the fact that we need more images on the ground. Our efforts should/shall continue. If not us, then who?
My eyes see a flat topped Pratt in the Bing view, but as Nathan pointed out it is difficult to make much out. Also, the wreckage appears to be a 1900-1910 vintage Pratt to me.
It looked more polygonal to my eyes.
Please clarify. The collapsed bridge pictured appears to be a pin-connected pony truss bridge. Pin connected bridges are usually (or never?) polygonal Warrens, which also almost always date to after 1908, and usually after 1920. There is not enough detail in the Birds Eye View for me to see anything worthwhile. My guess is it was really a Pratt.
Why is it called Humpback Bridge? The aerial photo seems to show a flat pony truss.
Are there any pictures of the bridge while standing?