I-5 - Marquam Bridge

Photos 

Marquam Bridge

From the west bank of the Willamette River

Photo taken by Michael Goff on October 20, 2008

Enlarge

BH Photo #126823

Map 

Street Views 

Facts 

Overview

Cantilevered Warren deck truss bridge over Willamette River on I-5 in Portland

Location

Portland, Multnomah County, Oregon

Status

Open to traffic

History

Built 1966, Seismic Retrofit 1996

Builders

- American Bridge Co. of New York (Steel Fabricator)
- Glenn S. Paxson (Assistant State Highway Engineer)
- Ivan D. Merchant (Bridge Engineer)
- Kiewit Corporation of Omaha, Nebraska (Contractor)
- Peter Kiewit & Sons of Omaha, Nebraska (Contractor)

Design

Warren deck truss

Dimensions

Length of largest span: 440.0 ft.
Total length: 1,044.0 ft.
Deck width: 57.0 ft.
Vertical clearance above deck: 15.3 ft.

Approximate latitude, longitude

+45.50775, -122.66935   (decimal degrees)
45°30'28" N, 122°40'10" W   (degrees°minutes'seconds")

Approximate UTM coordinates

10/525829/5039411 (zone/easting/northing)

Quadrangle map:

Portland

Inventory numbers

OR 08328 (Oregon Dept. of Transportation structure number)
BH 29880 (Bridgehunter.com ID)

Inspection (as of 07/2015)

Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Fair (5 out of 9)
Sufficiency rating: 70.0 (out of 100)

Average daily traffic (as of 2014)

88,500

Categories 

Update Log 

• October 28, 2014: New photos from Royce and Bobette Haley
• October 16, 2014: New photos from Royce and Bobette Haley
• July 10, 2014: New photo from Andrew Raker
• January 30, 2014: New photos from Mike Goff
• September 8, 2010: New Street View added by Michael Goff
• May 11, 2009: New photos from Michael Goff
• April 20, 2009: Posted HAER photos
• October 28, 2008: New photos from Michael Goff
• July 8, 2008: Updated by Michael Goff
• July 7, 2008: New photo from Michael Goff

Related Bridges 

• Hawthorne Bridge (Downstream)
• Ross Island Bridge (Upstream) - Future light rail suspension bridge between structures

Sources 

• Mike Goff - michael [dot] goff [at] hotmail [dot] com
• HAER OR-106 - Marquam Bridge, Spanning Willamette River at Interstate Highway 5, Portland, Multnomah County, OR
• Bridges of Portland - Ray Bottenberg, Arcadia Publishing, 2007
• The Portland Bridge Book - Sharon Wood Wortman, Oregon Historical Society Press, 2001
• Wikipedia - Marquam Bridge
• Andrew Raker
• Royce and Bobette Haley - roycehaley111 [at] yahoo [dot] com

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