Side View
A rare find in Oklahoma!
Photo taken by Rick Mattioni in September 2008
BH Photo #125483
I don't think this bridge was "narrowed" to use as a foot bridge, rather I think it was constructed originally as a foot bridge. It is of welded construction, and all historic bowstring road bridges are pin-connected. There are modern foot bridges that are bowstring, if by bowstring you mean the continuous curve of the top. None-the-less, it is an interesting bridge.
Field visited this bridge June 2016. Photos to eventually/someday end up on HistoricBridges.org. Key finding: I strongly believe this is a "FrankenBridge" pieced together from roof trusses. Evidence: overhead bracing is welded (and not part of roof trusses), empty holes running along top chord angle, and the angle legs face the same cardinal direction on the bridge (legs on a bridge would normally both face inward or outward.)