Fremont Bridge (Portland)
| Fremont Bridge | |
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| Coordinates | 45°32′16″N 122°40′57″W / 45.5377083°N 122.6825027°WCoordinates: 45°32′16″N 122°40′57″W / 45.5377083°N 122.6825027°W |
| Carries | Four lanes, two decks  I-405 / US 30
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| Crosses | Willamette River and surface streets |
| Locale | Portland, Oregon |
| Official name | Fremont Bridge |
| Maintained by | Oregon Department of Transportation |
| ID number | 02529 |
| Characteristics | |
| Design | Tied-arch bridge |
| Total length | 2,154 ft (656.5 m) |
| Height | 381 ft (116.1 m) |
| Longest span | 1,255 ft (382.5 m) longest in Oregon |
| Clearance above | 18.3 ft (5.58 m) |
| Clearance below | 175 ft (53.3 m) |
| History | |
| Opened | November 15, 1973 |
 Fremont Bridge
Location in Portland, Oregon
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The Fremont Bridge is a steel tied-arch bridge over the Willamette River located in Portland, Oregon, United States. It carries Interstate 405 and US 30 traffic between downtown and North Portland where it intersects with I-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). The bridge was designed by Parsons, Brinckerhoff, Quade and Douglas, and built by Murphy Pacific Corporation.
The bridge has two decks carrying vehicular traffic, each with four lanes. The upper deck is signed westbound on US 30 and southbound on I-405. The lower deck is signed eastbound on US 30 and northbound on I-405.
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. Designers modeled the bridge after the original 1964 Port Mann Bridge in Vancouver, British Columbia.
The steel tie-girder (I-beam) is 18-feet tall and 50-in wide. On October 28, 1971, while still under construction, a six-foot-long crack was found on the west span of this girder that required a $5.5 million redesign and repair. The ramps and approaches are steel box girders. If the lanes of the bridge were placed end-to-end, there are 3.27 lane-miles on the arch bridge and 14.12 lane-miles on the ramps and approaches.
The center span of the bridge, where the rib of the arch is above the deck, is 902 feet long. It was fabricated in California then assembled at Swan Island, 1.7 miles (2.7 km) downstream. After assembly it was floated on a barge the 1.7 mile trip to the construction site. On March 16, 1973, the 6,000-ton steel arch span was lifted 170 ft (52 m) using 32 hydraulic jacks. At the time, it was listed in the Guinness Book of World Records as the heaviest lift ever completed.
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Wikipedia