Abandoned Big Sioux River Bridge
Photo taken by John Marvig in January 2016
BH Photo #345278
Sounds like this bridge and two others in Sioux Falls will receive upgrades.
Mick, John is a contributor here, and the bridge already has an entry: https://bridgehunter.com/sd/minnehaha/bh36416/
This bridge is actually ex CNW.
And this bridge can be accessed by walking down the tracks...