Neawanna Creek Bridge

Map 

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Facts 

Overview

Concrete deck girder bridge over Neawanna Creek on U.S. 101 in Seaside

Location

Seaside, Clatsop County, Oregon

Status

Open to traffic

History

Built 1930

Builders

- Conde B. McCullough (Engineer)
- F. L. Odom (Contractor)

Design

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

Dimensions

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)

USGS topographic map

Gearhart

Inventory number

BH 37384 (Bridgehunter.com ID)

Inspection (as of 09/2007)

Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 54.5 (out of 100)

Average daily traffic (as of 2006)

16,200

Categories 

Update Log 

• 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

Sources 

• Michael Goff - michael [dot] goff [at] odot [dot] state [dot] or [dot] us
• Neawanna Creek Bridge HAER Webpage

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