Rating:
6 votes

Alexandra Avenue Bridge

Photos 

Alexandra Ave. Bridge

Photo taken by Michael Goff on June 1, 2008

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BH Photo #115899

Map 

Street View 

Facts 

Overview
Concrete arch bridge over a canyon on NW Alexandra Avenue in Portland
Location
Portland, Multnomah County, Oregon
Status
Open to traffic
History
Built 1922
Builders
- Fred T. Fowler (Design Engineer)
- Lindstrom & Feigenson of Portland, Oregon (Contractor)
- Olaf Laurgaard (Lead Engineer)
Design
The Alexandra Avenue Viaduct is an important example of braced spandrel construction, similar to that of Latourell Creek Bridge in the Columbia River Gorge. The arch ribs are not a continous structure, but consist of ten seperate chord members arranged in an arch form. The bridge features concrete trestle approach spans at each approach. The steel handrailing replaced the original precast panel concrete railing.
(Historical Highway Bridge of Oregon - 1989)
Dimensions
Length of largest span: 149.9 ft.
Total length: 272.0 ft.
Deck width: 16.1 ft.
Recognition
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+45.54056, -122.72278   (decimal degrees)
45°32'26" N, 122°43'22" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/521642/5043039 (zone/easting/northing)
Quadrangle map:
Portland
Inventory number
BH 29850 (Bridgehunter.com ID)
Inspection (as of 09/2015)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 47.5 (out of 100)
Average daily traffic (as of 2010)
109

Update Log 

  • June 7, 2012: Updated by Nathan Holth: This is not a concrete truss, it is a spandrel braced arch.
  • September 7, 2010: New Street View added by Michael Goff
  • November 17, 2008: Updated by Michael Goff: Added Builders
  • September 30, 2008: New photos from Michael Goff
  • June 25, 2008: New photo from Michael Goff

Sources 

Comments 

Alexandra Avenue Bridge
Posted July 1, 2012, by Fred Strombaugh (strombaughf [at] yahoo [dot] com)

My Grandfather Desiged this and other bridges in the Portland area.