HistoricBridges.org Menu: HistoricBridges.org Menu:


We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.

HistoricBridges.org: Bridge Browser

Marquam Bridge

Marquam Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 3, 2018

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
I-5 Over Willamette River
Location
Portland: Multnomah County, Oregon: United States
Structure Type
Metal Cantilever 14 Panel Multiple-Type-Connected Warren Deck Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1966 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: Ivan D. Merchant

Technical Facts

Rehabilitation Date
1996
Main Span Length
440 Feet (134 Meters)
Structure Length
5,280 Feet (1,609 Meters)
Roadway Width
114 Feet (34.75 Meters)
Spans
3 Main Span(s)
NBI Number
8328

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Data Pages, PDF

View Historic Bridge Inventory Sheet For This Bridge

HAER Documentation, Willamette River Bridges - Data Pages - Drawings -Timeline

This utilitarian mid-20th century truss bridge is noted for its unusual double-deck cantilever truss design. The bridge has a local reputation as the "ugly" bridge, since it lacks the aesthetics of earlier bridges, and even bridges built after this bridge such as the Fremont Bridge were designed with a greater attention to aesthetics (as unusual as that normally is in modern bridge design). Despite this reputation for being "ugly," the bridge is nicer looking than a typical slab of concrete, and it also has some interesting design details. Double-deck bridges are uncommon, and this example with its cantilever truss design is particularly unusual. The design includes a suspended span between the cantilever arms of the center truss span.  It appears this bridge was constructed using rivets to attach part of the truss gusset plates in a shop setting, while the remaining fasteners on the connections which would have been installed in the field were made using bolts. The bridge also includes an enormous and complex series of approach ramps, the design and details being beyond the scope of HistoricBridges.org's documentation. The total length given here is a rough measurement from each end of the approach ramps when traveling over the bridge via I-5, which comes out to about a mile in length. The National Bridge Inventory counts the "bridge" as just the three truss spans, which total 1,044 feet, however these truss spans do not even complete the crossing over the river, with adjacent ramp girder spans crossing the remainder of the river. An exact definition of where this bridge starts and ends is not easy to establish. The bridge has alterations that appear to be earthquake-related retrofits, particularly in the area of the hangers for the suspended span.

The general contractor for this bridge, Kiewit Corporation of Omaha, Nebraska, remains in business today as one of the largest contractors in the country. American Bridge Company was the steel fabricator for the bridge.


This bridge is tagged with the following special condition(s): Double-Deck

Divider

Photo Galleries and Videos: Marquam Bridge

 
View Photo Gallery
Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer

Divider

Maps and Links: Marquam Bridge

Coordinates (Latitude, Longitude):
45.507760,-122.669220

View Bridge Location In:

Bridgehunter.com: View listed bridges within a half mile of this bridge.

Bridgehunter.com: View listed bridges within 10 miles of this bridge.

Google Maps

Google Streetview (If Available)

Bing Maps

OpenStreetMap

Apple Maps (Via DuckDuckGo Search)

Apple Maps (Apple devices only)

MapQuest

HERE We Go Maps

ACME Mapper

Waze Map

Android: Open Location In Your Map or GPS App

Flickr Gallery (Find Nearby Photos)

Wikimedia Commons (Find Nearby Photos)

Directions Via Sygic For Android

Directions Via Sygic For iOS and Android Dolphin Browser

USGS National Map (United States Only)

Historical USGS Topo Maps (United States Only)

CalTopo Maps (United States Only)


Divider
 
Home Top

Divider

About - Contact

© Copyright 2003-2020, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.

Divider