Photos 

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Marquam Bridge

From the west bank of the Willamette River

Photo taken by Michael Goff on October 20, 2008

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Marquam Bridge

From the Hawthorne Bridge

Photo taken by Michael Goff on October 20, 2008

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Marquam Bridge

Photo taken by Michael Goff on July 6, 2008

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Marquam Bridge

from Portland Aerial Tram

Photo taken by Michael Goff on April 24, 2009

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Marquam Bridge and Interchange

from Portland Aerial Tram

Photo taken by Michael Goff on April 24, 2009

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Photo taken by Historic American Engineering Record

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Facts 

Overview
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 Erectors)
- Kiewit Pacific Co.
- Oregon State Highway Department (Engineers)
- Peter Kiewit & Sons (Contractor)
Design
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: 15.33 ft.
Inventory number
BH 29880 (Bridgehunter.com ID)

Update Log 

  • 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

Sources 

  • Michael Goff - michael [dot] goff [at] odot [dot] state [dot] or [dot] us
  • HAER OR-106 - Marquam Bridge, Spanning Willamette River at Interstate Highway 5, Portland, Multnomah County, OR

Comments 

Marquam Bridge
Posted May 14, 2009, by Ian Anderson (macsignals [at] gmail [dot] com)

Looks like a cantilevered deck truss, look at the truss pattern 3-4 panels out from the pier.