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Flatrock River Bridge


Photo taken by Anthony Dillon


BH Photo #136316


Lost through truss bridge over Flatrock River on US 421 on 575N-600W
Decatur County, Indiana
Replaced by new bridge
Built ca. 1930; replaced 1999
Parker through truss
Length of largest span: 198.2 ft.
Total length: 295.0 ft.
Deck width: 20.3 ft.
Vertical clearance above deck: 14.8 ft.
Approximate latitude, longitude
+39.42371, -85.59225   (decimal degrees)
39°25'25" N, 85°35'32" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/621171/4364743 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2017)
Inventory numbers
INNBI 1600003 (Indiana bridge number on the National Bridge Inventory)
BH 38937 (Bridgehunter.com ID)
Inspection report (as of April 2017)
Overall condition: Fair
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 94.4 (out of 100)
View more at BridgeReports.com

Update Log 

  • March 7, 2011: Updated by Jim Grey: Corrected GPS coordinates
  • April 1, 2009: New photo from Anthony Dillon
  • January 31, 2009: Added by James Baughn



Flatrock River Bridge
Posted April 4, 2009, by Tom Hoffman (tehoffm [at] hotmail [dot] com)

The comment above or below was me!

Flatrock River Bridge
Posted April 4, 2009, by Anonymous

This was a neat example of an early state highway Parker truss on a decomissioned state highway. US 421 was shifted over to I-74 upon completion in the 60s, and the county took over the road and bridge and I'd say not maintaining well. The weight limit went down to two tons all of a sudden and the bridge was shut down after numerous semis were spotted crossing. Afterwards the county just threw it away! By the way thanks for adding the photo Tony!