Public Domain: Copyright Expired
BH Photo #439198
I'm slowly tracking down information on the bridges.
LostBridges gives a ca. 1889 build date for the uncovered wooden Howe truss, and both the Lake City Museum and a DRGW railfan state that both the bridges were torn down in 1937
I've yet to find a build date for the steel truss, but based on this picture: https://ngtrainpics.photoshelter.com/gallery-image/RD032-D-R... it's probably from the same era and this similar bridge: http://bridgehunter.com/co/fremont/bh72121/
A Colorado-specific trade magazine gave info for the arch and a build date for the old road, though we still have no clue about who built the pony truss.
Someone needs to write a descriptive essay about this cluster of bridges, their origins and flooding.