2 votes

Rockwell Road Bridge


Photo taken by Steve Conro in December 2011


BH Photo #221661



Pratt deck truss bridge over Little Vermillion River on Rockwell Road in LaSalle
LaSalle, LaSalle County, Illinois
Open to traffic with restrictions
Built 1904; Abandoned 1934; Converted for road use 1940
- Chicago & Illinois Valley Railway (C&IV)
- Chicago, Ottawa & Peoria Railway (CO&P)
- Illinois Valley Railway (IV)
- Interurban
Pratt deck truss
Length of largest span: 106.0 ft.
Total length: 158.1 ft.
Deck width: 20.0 ft.
Also called
IV - Little Vermillion River Bridge
CO&P - Little Vermillion River Bridge
Approximate latitude, longitude
+41.32790, -89.08347   (decimal degrees)
41°19'40" N, 89°05'00" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/325643/4577251 (zone/easting/northing)
Quadrangle map:
La Salle
Average daily traffic (as of 2016)
Inventory numbers
IL 050-6502 (Illinois bridge number)
BH 47632 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Poor
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Poor (4 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 27 (out of 100)
View more at BridgeReports.com

Update Log 

  • July 14, 2015: New photos from John Marvig
  • May 12, 2015: New photos from Gene Smania
  • May 12, 2015: Updated by Luke: Edited entry to show that the bridge is a converted interurban bridge.
  • August 24, 2013: Updated by Luke Harden: Added city
  • December 13, 2011: Updated by Steve Conro: Changed name added more photos
  • January 11, 2011: Added by J.P.


  • J.P. - wildcatjon2000 [at] gmail [dot] com
  • Steve Conro - sconro [at] yahoo [dot] com
  • Luke
  • John Marvig - marvigj27 [at] gmail [dot] com


Rockwell Road Bridge
Posted August 26, 2021, by John Marvig (marvigj27 [at] gmail [dot] com)


Page 338 of this link seems to suggest that the bridge is older than 1904. An iron bridge existed at this location in 1888, although I am not sure if it was the same bridge.

Rockwell Road Bridge
Posted May 12, 2015, by Nathan Holth (webmaster [at] historicbridges [dot] org)

The quantity and thickness of the bottom chord eyebars also is larger than typically seen on pin-connected highway trusses... another clue to the bridge's non-highway origins. Great work solving this mystery!

Rockwell Road Bridge
Posted May 12, 2015, by Luke

I had a hunch that this was ex-interurban based off of this map: http://www.historicmapworks.com/Map/US/1575037/Township+33+N... as well as the fact that it's pin connected truss with a 1940 "build" date.

Another giveaway that was pointed out by John was the presence of stringers commonly seen on railroad bridges to support the tracks.

John also used his research methods to find aerial imagery from 1939 to help confirm that there was a bridge there prior to 1940.

Vermillion River Bridge
Posted March 16, 2011, by Gene Smania

The structure carries Rockwell Road over the Little Vermilion River. In January/February 1988 the steel bent supporting the east span was damaged by ice. A temporary bridge was built just upstream of the structure until repairs were completed. There is a railroad structure within a few feet of the downstream side and beyond that is the Illinois & Michigan Canal viaduct which carries the canal and towpath over the Little Vermilion River.