1 vote

Humpback Bridge


Dry Creek Bridge

Lost, washed away by flooding in May of 2013.

Photo taken by Buchanan County


BH Photo #255121



Adam Amdor of KWWL news reports that the Humpback Bridge was washed away by flooding.


Pratt half-hip pony truss bridge over Dry Creek on 300th Street
Buchanan County, Iowa
Destroyed by flooding
Built 1901, washed away by flooding in May, 2013
- New Columbus Bridge Co. of Columbus, Ohio
Half-hip Pratt pony truss
Length of largest span: 47.9 ft.
Total length: 48.9 ft.
Deck width: 15.7 ft.
Also called
Dry Creek Bridge
Approximate latitude, longitude
+42.35461, -91.65069   (decimal degrees)
42°21'17" N, 91°39'03" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/611124/4690031 (zone/easting/northing)
Quadrangle map:
Troy Mills
Land survey
T. 87 N., R. 7 W., Sec. 15
Average daily traffic (as of 2005)
Inventory numbers
IA 80830 (Iowa bridge number)
BH 12934 (Bridgehunter.com ID)
Inspection report (as of November 2012)
Overall condition: Poor
Superstructure condition rating: Critical (2 out of 9)
Substructure condition rating: Serious (3 out of 9)
Deck condition rating: Serious (3 out of 9)
Sufficiency rating: 22.4 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 10, 2014: New photo from Jack Schmidt
  • June 5, 2013: Updated by Luke Harden: Corrected builder to the prexisting category. "deleted" the new category.
  • June 5, 2013: Updated by Jason Smith: Added category "5-panel truss"
  • May 31, 2013: Updated by J.R. Manning: Changed status to lost after finding out the bridge was washed away by flooding
  • April 12, 2010: Updated by J.R. Manning: Updated Road Name


  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • Jason Smith - flensburg [dot] bridgehunter [dot] av [at] googlemail [dot] com
  • Luke
  • Jack Schmidt - jjturtle [at] earthlink [dot] net


Humpback Bridge
Posted June 5, 2013, by Jason Smith (JDSmith77 [at] gmx [dot] net)

I think I have the problem solved. This bridge was a Pratt half-hip pony truss bridge with pinned connections built in 1901 by the New Columbus Bridge Company of Columbus, OH. This according to a bridge survey conducted by Fraser Design in the 1990s. In either case, it's really sad that the bridge is gone by the floods.

Humpback Bridge
Posted June 3, 2013, by K. A. Erickson

Pratt, Parker, either way it just underscores the fact that we need more images on the ground. Our efforts should/shall continue. If not us, then who?

Humpback Bridge
Posted June 3, 2013, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)

My eyes see a flat topped Pratt in the Bing view, but as Nathan pointed out it is difficult to make much out. Also, the wreckage appears to be a 1900-1910 vintage Pratt to me.

Humpback Bridge
Posted June 2, 2013, by Luke Harden (lukemh9 [at] gmail [dot] com)

It looked more polygonal to my eyes.


Humpback Bridge
Posted June 2, 2013, by Nathan Holth (webmaster [at] historicbridges [dot] org)

Please clarify. The collapsed bridge pictured appears to be a pin-connected pony truss bridge. Pin connected bridges are usually (or never?) polygonal Warrens, which also almost always date to after 1908, and usually after 1920. There is not enough detail in the Birds Eye View for me to see anything worthwhile. My guess is it was really a Pratt.

Humpback Bridge
Posted May 31, 2013, by B. Lauver (bllauver [at] toad [dot] net)

Why is it called Humpback Bridge? The aerial photo seems to show a flat pony truss.

Are there any pictures of the bridge while standing?