I know very little about the bridge, its history, or why it was even built in the first place. One end of the bridge connects to a gravel road that sees very little traffic. There are no towns or cities for dozens of miles on the south end, and very little farming. The bridge is typical of a 1960s steel girder bridge. It is somewhat narrow, lacks shoulders, and has the old style guard rails. That hardly seems to matter much since one would only cross this bridge if they really wanted to go out of their way to find it.
A local resident of Sprole tells me that there was a ferry boat crossing at this location prior to the bridge being built. The ferry was so small that only one car at a time fit on the deck of the boat. If the bridge was not available, there would be a 54 mile gap between Missouri River bridges between Wolf Point and Culbertson.