Harley, I can pretty much assure you that any of these state built spans from the 30's and 40's did indeed replace earlier structures! Most state highways were important early roads that were taken over by the state starting in the 1920's, and many of those had bridges that were quickly deemed inadequate for heavier traffic.
Our county board soon recognized the necessity of better crossings over the streams of the county. At the June session of 1870, seven thousand dollars was appropriated to erect a 130-foot iron span bridge on stone work near Thorntown, over Sugar Creek; also five thousand dollars to erect a similar structure over Eagle Creek at Zionsville, and four thousand dollars for one over Sugar Creek at Mechanicsburg. The erection of these three structures were all made out of general county revenue. For ten years our county fathers were content without further bridge accommodations.
If this was built in the 1940's, there must have been one previous.
My thanks to the webmaster on the posting of my bridge pics.
Was wondering why the pics I took of this bridge hasn't been made permanent. I've seen where the admins will add the bridges to the detail section, and the credit of the photographer duly noted.
Shame there isn't a photo for this bridge. Can anyone go out and take photos then upload them? Because this bridge is truly a beautiful bridge and should have photos.