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Neawanna Creek Bridge


Neawanna Creek Bridge

Photo taken by Michael Goff in September 7, 2008


BH Photo #123263

Street Views 


Concrete deck girder bridge over Neawanna Creek on U.S. 101 in Seaside
Seaside, Clatsop County, Oregon
Open to traffic
Built 1930
- Conde B. McCullough of Redfield, South Dakota (Bridge Engineer)
- Odom, F.L.
The Neawanna Creek Bridge is significant as an intact example of a 1930s continuous concrete, multi-span highway bridge, utilizing Hardy Cross's moment distribution theory, and for its association with C.B. McCullough, Oregon's premier bridge engineer. The configuration of continuous concrete T-Beam construction utilized in the design of the 1930 Neawanna Creek Bridge represents a significant change in structural engineering theory and reinforced concrete technology by applying the moment distribution technique of distributing loads on girder structures. The moment distribution theory for continuous concrete frames was developed in the late 1920s by Hardy Cross, a civil engineer and professor of structural engineering at the University of Illinois. Hardy Cross was regarded by his contemporaries as a leader in a new school of thought in the field of structural analysis, and his theory is regarded by many architects and engineers to be one of the more significant structural theories developed during the 20th century.
Information from HAER Neawanna Creek Bridge Page
Length of largest span: 52.5 ft.
Total length: 210.0 ft.
Deck width: 26.9 ft.
Approximate latitude, longitude
+46.01056, -123.91139   (decimal degrees)
46°00'38" N, 123°54'41" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/429442/5095624 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2016)
Inventory numbers
OR 01305 (Oregon Dept. of Transportation structure number)
BH 37384 (Bridgehunter.com ID)
Inspection report (as of September 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 49 (out of 100)
View more at BridgeReports.com

Update Log 

  • April 24, 2011: New photos from K. A. Erickson
  • April 27, 2010: New Street View added by Michael Goff
  • April 20, 2009: Posted HAER photos
  • October 29, 2008: Updated by Michael Goff: Edited Builders
  • October 7, 2008: Updated by Michael Goff: Added design description and builder
  • September 8, 2008: Added by Michael Goff


  • Mike Goff - michael [dot] goff [at] hotmail [dot] com
  • HAER OR-129 - Neawanna Creek Bridge, Spanning Neawanna Creek at Milepoint 19.72 on U.S. 101 (Oregon Coast Highway), Seaside vicinity, Clatsop County, OR
  • K. A. Erickson