Bridgehunter.com | I-5 - Marquam Bridge

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Marquam Bridge

From the west bank of the Willamette River

Photo taken by Michael Goff on October 20, 2008

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 (Contractor)
- Peter Kiewit & Sons (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)
USGS topographic map: Portland
Inventory numbers: OR 08328 (Oregon Dept. of Transportation structure number)
BH 29880 (Bridgehunter.com ID)
Inspection (as of 05/2010): Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Good (7 out of 9)
Sufficiency rating: 81.0 (out of 100)
Average daily traffic (as of 2010): 88,600

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

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

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.