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474th Avenue Bridge (Old)


474th Avenue Bridge (Old)

looking southwest

HAER Photo

View this photo at Wikimedia Commons

BH Photo #481934


This bridge was reportedly converted from railroad use to road use in the 1930s as part of a WPA project. HAER SD-51 suggests that the bridge may have been a part of the parallel Chicago, Milwaukee, St. Paul & Pacific "Milwaukee Road" line, although there is no known Quadrangular Truss as such that would have ever been used on the Milwaukee Road. It is likely that this truss either came from a Chicago, Rock Island & Pacific line, or from a Chicago, St. Paul, Minneapolis & Omaha line, both of which were known to use this design extensively. Bridge has been stored south of Dell Rapids, along Juanita Avenue, since 1997.


Lost Quadrangular Through truss bridge over Big Sioux River on 474th Avenue
Dell Rapids, Minnehaha County, South Dakota
Replaced by a new bridge
Relocated here Ca. 1930, Replaced and put into storage 1997
- Lassig Bridge & Iron Works of Chicago, Illinois
Quadrangular lattice through truss
Total length: 108.0 ft.
Approximate latitude, longitude
+43.79640, -96.72913   (decimal degrees)
43°47'47" N, 96°43'45" W   (degrees°minutes'seconds")
Approximate UTM coordinates
14/682688/4851765 (zone/easting/northing)
Inventory number
BH 90682 (Bridgehunter.com ID)

Update Log 

  • September 20, 2020: Updated by John Marvig: added information
  • September 20, 2020: Updated by Luke: Added builder per truss design
  • September 20, 2020: New photo from Geoff Hubbs

Related Bridges 


  • Geoff Hubbs
  • Luke
  • John Marvig - marvigj27 [at] gmail [dot] com


474th Avenue Bridge (Old)
Posted September 20, 2020, by Tony Dillon (spansaver [at] hotmail [dot] com)

As of the latest imagery it's still sitting pretty!

474th Avenue Bridge (Old)
Posted September 20, 2020, by John Marvig (marvigj27 [at] gmail [dot] com)

Data sheets for this bridge suggest it was converted to road as a WPA project in the 1930s:


I don't believe that this came from the parallel railroad bridge however. There is not a single known Quadrangular truss of any sort along the Milwaukee Road, who built the parallel line. Minnehaha County had two other railroads that were known to build such bridges, including the Rock Island and the Omaha Road. With so many realignments of the Big Sioux River during that era, it would not surprise me if this span came from the Sioux Falls area. Another possibility is the former Rock Island crossing of the Big Sioux near Shindler. Historic aerial imagery shows what appears to be a newish looking deck girder bridge at that location in 1938, although it is far too blurry to tell for sure. Until I can find a 108' truss that makes sense, this one may remain a mystery for a long time.

It would be excellent to see this one, which is still stored near Dell Rapids, get reused somewhere. As I understand, they originally wanted to, but the price tag was too high when they were planning it in the late 90s.