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I-5 - Marquam Bridge

Multnomah County, Oregon
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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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Street Views 

View Uglybridges.com report

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

Categories 

American Bridge Co. (601)
Built 1966 (117)
Built during 1960s (1,345)
Cantilevered (247)
Cantilevered truss (225)
Deck truss (1,099)
Double decker (37)
Glenn S. Paxson (51)
Have street view (14,754)
Interstate 5 (34)
Ivan D. Merchant (10)
Kiewit Corporation (6)
 Multnomah County, Oregon (67)
Open (30,527)
Oregon (711)
Owned by state (10,585)
Peter Kiewit & Sons (9)
Portland, Oregon (35)
Span length 250-500 feet (916)
Total length 1000-2500 feet (1,308)
Truss (25,072)
Warren deck truss (395)
Warren truss (4,439)
Willamette River (47)

Update Log 

  • 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
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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.