One of the bigger mysteries has been solved. The span was officially known as Cole's Ford Bridge and was completed on December 7, 1871 as a wrought iron tubular arch by the King Bridge Company of Cleveland, Ohio. The span was demolished or severely damaged in the flood of 1883 and a bid was let to the Wrought Iron Bridge Company for a Parker and two Pratt truss spans.
The bridge was bypassed in 1938 when a relocated IN 62/US 460 was completed, and the span was abandoned in or around 1984. The deck was removed by 1987.
More can be found at my site: http://bridgestunnels.com/bridges/indiana/precinct-school-road-blue-river-bridge/
The bridge is also called Cole's Ford Bridge per my conversation with Richard Eastwick (Crawford County historian) in 2009.
this bridge is also the 650south bridge that is listed on the page. Discovered this on the SHAARD website. https://secure.in.gov/apps/dnr/shaard/welcome.html this the link to the main page.
There's something amiss with the story on this bridge. The massive cut stone abutments that support the structure are pre-1900. They would not have been built in 1959. Perhaps the Pratt span (which would have been built on stone) was actually built at this location, with maybe a larger Whipple truss that was lost. Or at least there was another structure there that was replaced with these two spans for some reason. I just know that the abutments pre-date the timeline given. If anyone knows more on this story...please comment. THANKS