Rating:
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J Avenue Overpass

Boone County, Iowa

Photos 

Oblique View

From the northeast side.

Photo taken by J.R. Manning

BH Photo #109484

Map 

Description 

Bridge is likely built using a former Chicago & North Western Railway span, which has been reconstructed for road use.

Facts 

Overview
Pony truss bridge over Union Pacific Railroad on J Avenue
Location
Boone County, Iowa
Status
Open to traffic
History
Built 1900
Railroads
- Chicago & North Western Railway (CNW)
- Union Pacific Railroad (UP)
Design
Riveted double-intersection Warren pony truss
Dimensions
Length of largest span: 69.9 ft.
Total length: 140.1 ft.
Deck width: 18.4 ft.
Also called
Hump Bridge
Approximate latitude, longitude
+42.05213, -93.98946   (decimal degrees)
42°03'08" N, 93°59'22" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/418121/4656038 (zone/easting/northing)
Quadrangle map:
Boone West
Land survey
T. 84 N., R. 27 W., Sec. 27
Average daily traffic (as of 2007)
120
Inventory numbers
IA 77860 (Iowa bridge number)
BH 12908 (Bridgehunter.com ID)
Inspection report (as of May 2009)
Overall condition: Poor
Superstructure condition rating: Serious (3 out of 9)
Substructure condition rating: Poor (4 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 14.6 (out of 100)
View more at BridgeReports.com

Categories 

Boone County, Iowa (112)
Built 1900 (927)
Built during 1900s (7,468)
Chicago & North Western Railway (1,422)
Double-intersection Warren pony truss (207)
Double-intersection Warren truss (465)
Iowa (6,670)
Modified (38)
Open (40,323)
Owned by county (21,282)
 Pony truss (16,660)
Rail-to-overpass (64)
Riveted (2,254)
Skewed (4,970)
Span length 50-75 feet (10,281)
Structurally deficient (13,379)
Total length 125-175 feet (6,051)
Truss (34,153)
Union Pacific Railroad (2,399)
Wooden deck (6,107)

Update Log 

  • September 6, 2018: New photos from Daniel Barnes
  • July 31, 2018: New photos from Daniel Barnes
  • February 25, 2017: New photos from Daniel Barnes
  • October 11, 2016: New photos from John Marvig
  • June 2, 2015: New photos from Kevin Skow
  • May 15, 2014: New photos from Lee Smith
  • March 28, 2013: New photos from John Marvig
  • September 2, 2011: Updated by Luke Harden: Added alternate name
  • February 19, 2010: Updated by J.R. Manning: Updated Location

Related Bridges 

Sources 

  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • Luke
  • John Marvig - marvigj27 [at] gmail [dot] com
  • Lee Smith - ljsmith_32 [at] hotmail [dot] com
  • Kevin Skow - weatherbum [at] hotmail [dot] com
  • Daniel Barnes
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Comments 

J Avenue Bridge
Posted May 6, 2013, by C J Johnson (108stitchesiowa [at] netzoola [dot] com)

Union Pacific trains roar many times daily under this bridge at well over 50+ mph before crossing the new concrete Kate Shelley High Bridge completed East of this bridge. I believe that this bridge is sometimes referred to as the "Humpback Bridge".

Photo taken Winter 2013.

UPRR Bridge
Posted July 16, 2007, by Lugnuts (thekitchenguy [at] sbcglobal [dot] net)

This bridge is located off 200th Street on L Road, a dead-end road, and provides the only access over the double-tracked Union Pacific mainline that some proptery owners have. The fence posts along the road leading away from the bridge appear to have been cut from a shoe tree.

This is a virtual twin to the pony truss bridge listed as #77840. The twin tracks shown continue west, cross the Des Moines River on the Kate Shelly Bridge (see Truss Bridge #77850 for more about the Kate Shelly Bridge) then curves to the southwest and goes under #77840.

The bridge is all wood timbered and wood decked. It has little trafic but appears to be well maintained.

Webmaster's note: The photos that were here have been incorporated into the main site.