Fremont Bridge (Portland)
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| Fremont Bridge | |
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| Official name | Fremont Bridge |
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| Carries | Interstate 405 and U.S. Route 30 |
| Crosses | Willamette River and surface streets |
| Locale | Portland, Oregon |
| Maintained by | ODOT |
| ID number | 02529 |
| Design | Tied arch bridge |
| Longest span | 1,255 ft (382.5 m) longest in Oregon |
| Total length | 2,154 ft (656.5 m) |
| Vertical clearance | 18.3 ft (5.58 m) |
| Clearance below | 175 ft |
| Opening date | November 11th, 1973 |
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The Fremont Bridge is a steel tied arch bridge over the Willamette River located in Portland, Oregon. It carries Interstate 405 and U.S. Highway 30 traffic between downtown and North Portland where it intersects with Interstate 5. It has the longest main span of any bridge in Oregon and is the second longest tied arch bridge in the world (after Caiyuanba Bridge across the Yangtze River, China).[1]
Due to the public's dissatisfaction with the appearance of the Marquam Bridge, the Portland Art Commission was invited to participate in the design process of the Fremont. The improvement in visual quality resulted in a bridge that was nearly six times as expensive as the purposely-economical Marquam Bridge.
In October of 1971, while still under construction, a crack was found on the west span girder that required a $5.5 million redesign and repair. The main span of the bridge was built in California then assembled at Swan Island, 1.7 miles downstream.[1] After completion it was floated in place on a barge. On March 16, 1973 the 6,000 ton steel arch span was lifted 170 ft. using 32 hydraulic jacks. At the time, it was listed in the Guinness Book of World Records as the heaviest lift ever completed.[2] The bridge was open on November 11, 1973 at a final cost of $82 million, most of which was financed by the Federal Highway Administration.
The bridge was named for John Charles Fremont, though one of the connecting streets was previously named Fremont Street in honor of the same individual. Designers modeled the bridge after the Port Mann Bridge in Vancouver, British Columbia. The bridge has two decks carrying vehicular traffic, each with four lanes. Westbound (as signed on US-30, also southbound on I-405) traffic is on the upper deck, eastbound (northbound) traffic on the lower deck.
The Fremont Bridge was also the 26th Peregrine falcon nest site designated in Oregon after the raptor was placed on the U.S. Threatened and Endangered Species list in 1970.[3]
[edit] Gallery
 Fremont Bridge and the skyline of Portland |
 From the est end |
 Bridge Pedal on the top deck of the Fremont Bridge |
HAER diagram |
[edit] References
- ^ a b Wood, Sharon; Wortman, Ed (2006). The Portland Bridge Book (3rd Edition). Urban Adventure Press, 23-30. ISBN 0-9787365-1-6.
- ^ Smith, Dwight A. (1989). Historic Highway Bridges of Oregon. Oregon Historical Society Press, 300. ISBN 0-87595-205-4.
- ^ Fremont Bridge Peregrines: A Decade of Successful Nesting. Audubon Society of Portland. Retrieved on 2006-11-06.
[edit] External links
- Historic American Engineering Record (Library of Congress) Fremont Bridge, Spanning Willamette River, Portland, Multnomah County, OR
- More Fremont Bridge photos at portlandbridges.com
| Bridges in the metropolitan area of Portland, Oregon See also: Transportation in Portland, Oregon | |
| Across the Willamette River (north to south)
St. Johns Bridge - Burlington Northern Railroad Bridge 5.1 - Fremont Bridge - Broadway Bridge - Steel Bridge - Burnside Bridge - Morrison Bridge - Hawthorne Bridge - Marquam Bridge - Ross Island Bridge - Sellwood Bridge - Lake Oswego Railroad Bridge - Abernethy Bridge - Oregon City Bridge |
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| Across the Columbia River (west to east)
Burlington Northern Railroad Bridge 9.6 - Interstate Bridge - Glenn L. Jackson Memorial Bridge |
| Crossings of the Willamette River | |||
|---|---|---|---|
| Upstream Broadway Bridge |
Fremont Bridge |
Downstream Burlington Northern Railroad Bridge 5.1 BNSF Railway |
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