Nathan - can you delete Photo 1 which is actually of the Poquessing Creek Bridge, BH 87682.
I've seen them on some Stone Arch spans in Indiana. Likely added by a county engineer that may or may not have known what they were doing.
I see braces on the arches that look like they've been there awhile while looking on streetview.Has anybody ever seen these braces because I never did.
Photo 1 (BH 309262) is actually of the Poquessing Creek Bridge, located to the northeast
Photo #1 deleted.