1 vote

Arrah Wanna Road Bridge


Arrah-Wanna Road Bridge

Photo taken by Michael Goff on April 27, 2008


BH Photo #114915


Polygonal Warren pony truss bridge over Salmon River on Arrah Wanna Road
Clackamas County, Oregon
Replaced by a new bridge
Built 1957, Replaced 2012
- Coast Bridge Co. of Portland, Oregon (Truss Design and Fabrication)
Polygonal Warren pony truss
Length of largest span: 100.0 ft.
Total length: 117.1 ft.
Deck width: 15.0 ft.
Approximate latitude, longitude
+45.33849, -121.97372   (decimal degrees)
45°20'19" N, 121°58'25" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/580409/5021065 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2010)
Inventory numbers
OR 06572 (Oregon Dept. of Transportation structure number)
BH 29852 (Bridgehunter.com ID)
Inspection report (as of July 2011)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 29.2 (out of 100)
View more at BridgeReports.com

Update Log 

  • June 20, 2013: Updated by John Marvig: Bridge is lost
  • April 16, 2012: Updated by Nathan Holth: This bridge is now doomed.
  • June 10, 2008: New photos from Michael Goff



Arrah Wanna Road Bridge
Posted March 14, 2011, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)

Here is an interesting article from Portland's Oregonian about a couple who is trying to adopt the Arrah Wanna Road Bridge over the Salmon River. I wish them luck on the endeavor.


On a side note related to the article, I browsed the ODOT records and found the standard drawing that dates from 1911 for this type of pony truss. These standard drawings pre-date the 1913 creation of the highway department and were developed by the Coast Bridge Company of Portland, Oregon. Thanks to this, I believe I can now trace this standard design to at least a couple of different pony truss bridges in the state.

Another step forward in determining the origin of these turn of the century relocated trusses!