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6th Street Bridge

William Duby Bridge

6th Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 23, 2014

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Key Facts

Umatilla: Umatilla County, Oregon: United States
Structure Type
Concrete Open Spandrel Deck Arch, Fixed and Approach Spans: Concrete T-Beam, Fixed
Construction Date and Builder / Engineer
1917 By Builder/Contractor: Unknown and Engineer/Design: Conde Balcom McCullough (Oregon State Highway Commission)

Technical Facts

Rehabilitation Date
Main Span Length
110 Feet (33.5 Meters)
Structure Length
432 Feet (131.5 Meters)
Roadway Width
30.2 Feet (9.2 Meters)
3 Main Span(s) and 6 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Section 106 Documentation For The 2012 Rehab of This Bridge

This bridge is an attractive arch bridge. It was built in 1925, however in 1950, it was widened by adding an arch structure to the south side of the bridge. The 1950 section replicated the architectural details of the 1925 portion. The only exception was that the railings were replaced with steel picket railings. In 2012, the bridge was rehabilitated again. Two-tube railing was place in front of the 1950 railing, which was retained.

Information and Findings From Oregon's Historic Bridge Inventory


Three 110-ft reinforced concrete open-spandrel, rib-type deck arch spans with six reinforced concrete deck girder approach spans Additional Significance: This bridge, which was widened with a similar structure in 1950, features a number of decorative details, including arched spandrel walls and arched façades on the approach spans. The widening replicates these features, though it replaced the railing with picket rail.


Oregon State Highway Department under C.B. McCullough


In 1917, when the Oregon State Highway Commission first surveyed the route of the Columbia River Highway beyond the Columbia River Gorge, they intended for the highway to run along the river as far as the town of Umatilla, before turning south as the Old Oregon Trail Highway. Instead, when construction of the highway reached Umatilla County in 1926, they decided to extend it to the Washington State Line, eventually designating this last segment as US 730. There are very few bridges along this portion of highway, and only two retain any sense of that original era.

Character Defining Features

Location on historic Columbia River Highway, Decorative features and railings, Structure type


In addition to the 1950 widening, this bridge received a rehab in 2012 which involved repairs to the concrete and a deck overlay. The railing has also been protected behind 2 Tube steel rail.

Bridge Considered Historic By Survey: Yes


Photo Galleries and Videos: 6th Street Bridge

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Maps and Links: 6th Street Bridge

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