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Chilson Bridge


Photo taken for the NRHP


View this photo at npgallery.nps.gov

BH Photo #480798


Lost Pratt deck truss bridge over an abandoned railroad line on CR 79, 4 mi. east and 1.8 mi. north of Edgemont
Fall River County, South Dakota
Replaced by a new bridge
Built 1929; Replaced 2020
- Chicago, Burlington & Quincy Railroad (CBQ)
Pratt deck truss
Length of largest span: 103.0 ft.
Total length: 183.1 ft.
Deck width: 20.0 ft.
Posted to the National Register of Historic Places on December 9, 1993
Approximate latitude, longitude
+43.32965, -103.73429   (decimal degrees)
43°19'47" N, 103°44'03" W   (degrees°minutes'seconds")
Approximate UTM coordinates
13/602613/4798200 (zone/easting/northing)
Quadrangle map:
Flint Hill
Average daily traffic (as of 2013)
Inventory numbers
SD 24-162-102 (South Dakota structure number)
NRHP 93001287 (National Register of Historic Places reference number)
BH 32209 (Bridgehunter.com ID)
Inspection report (as of April 2016)
Overall condition: Poor
Superstructure condition rating: Serious (3 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Serious (3 out of 9)
Sufficiency rating: 26.4 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 9, 2020: Updated by Mike Kerkau: Updated status; Google search confirms replacement was this year
  • September 8, 2020: New photos from Luke
  • March 14, 2019: Updated by Luke: Noted being a relocated span and noted that it's doomed.
  • June 27, 2016: Updated by J.P.: updated location


  • J.P. - wildcatjon2000 [at] gmail [dot] com
  • Luke
  • Chilson Bridge Closure - Info on Closure
  • Mike Kerkau - mjkerkau [at] gmail [dot] com


Chilson Bridge
Posted September 9, 2020, by Mike Kerkau (mjkerkau [at] gmail [dot] com)

The fact that such a remote area has any StreetView at all, outdated or not, is surprising enough.

Chilson Bridge
Posted September 8, 2020, by Luke

Streetview imagery here hasn't been updated since 2008.

Chilson Bridge
Posted September 8, 2020, by John Marvig (marvigj27 [at] gmail [dot] com)

Man, this one sucks. I have often wondered the history of it. It clearly is older than 1929, but what was the original use? It looks just a little too light to have been built for railroad use, but you really never know with the railroads.

Chilson Bridge
Posted September 8, 2020, by Anonymous

This one fully replaced