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I-5 - Fords Bridge


I-5 Fords Bridge

Photo Courtesy of the Oregon Department of Transportation


BH Photo #193808


Lost Warren deck truss bridge over South Umpqua River on I-5
Douglas County, Oregon
Replaced by new bridge
Built 1957; Replaced 2003
- P. Mervyn Stephenson (Bridge Engineer)
The 565-foot Fords Bridge on Interstate 5 was a six span structure crossing the South Umpqua River just north of Canyonville, Oregon. The two main spans were 140-foot steel Warren deck trusses, which spanned the main South Umpqua Channel. The reinforced concrete deck girder approach spans measured a total of 249-feet. The north approach was a single span of 57-feet, while the south approach consisted on three 74-foot spans. Both northbound and southbound traffic were carried over the South Umpqua on a 65-foot wide deck.
The bridge was designed by the Oregon State Highway Department bridge section under the watch of State Bridge Engineer P. Mervyn Stephenson.
In 2003 the Fords Bridge was replaced by two twin steel deck girder bridges after substantial shear cracking was discovered in the approach spans. The deterioration of the approach spans led to major temporary reinforcement of the structure to keep it open to freeway traffic while the replacements were being constructed.
Length of largest span: 140.0 ft.
Total length: 565.0 ft.
Deck width: 65.0 ft.
Approximate latitude, longitude
+42.94784, -123.32393   (decimal degrees)
42°56'52" N, 123°19'26" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/473574/4755072 (zone/easting/northing)
Quadrangle map:
Inventory numbers
OR 00509C (Oregon Dept. of Transportation structure number)
BH 48161 (Bridgehunter.com ID)

Update Log 

  • February 17, 2011: Added by Michael Goff

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  • Mike Goff - michael [dot] goff [at] hotmail [dot] com