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I-5 - Marquam Bridge

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Photos 

Marquam Bridge

From the west bank of the Willamette River

Photo taken by Michael Goff on October 20, 2008

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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 06/2012)
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 2010)
88,600

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 

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

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.