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North Umpqua River Bridge


North Umpqua River Bridge

Photo taken by Michael Goff on March 7, 2010


BH Photo #157473


The bridge at the Soda Springs Dam over the North Umpqua River is a pin-connected Pratt through truss. The pin-connected design would indicate the bridge was fabricated far earlier than its 1955 construction date. This bridge is more than likely a recycled bridge from another area and was placed it its current location in 1955 as part of the North Umpqua River Hydroelectric Project. The bridge is estimated to be built between 1900 and 1920.

North Umpqua Hydroelectric Project is located in south central Oregon in a remote area of Douglas County, about 60 miles east of Roseburg. Constructed between 1947 and 1956, the eight hydroelectric developments use water primarily from the North Umpqua River and from two of its major tributaries, the Clearwater River and Fish Creek, to generate electricity.

(Hydro Project Data Courtesy of PacificCorp North Umpqua River Project Overview)


Pratt through truss bridge over North Umpqua River on Soda Springs Road
Douglas County, Oregon
Replaced by a new bridge in 2010
Future prospects
Replaced as part of the Soda Springs Dam fish passage project in 2010.
Built 1955, Replaced 2010
The North Umpqua River Bridge at the Soda Springs Dam is a pin-connected Pratt through truss.
Length of largest span: 140.0 ft.
Total length: 172.9 ft.
Deck width: 14.1 ft.
Vertical clearance above deck: 20.0 ft.
Approximate latitude, longitude
+43.30306, -122.49660   (decimal degrees)
43°18'11" N, 122°29'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/540829/4794593 (zone/easting/northing)
Quadrangle map:
Toketee Falls
Inventory number
BH 29953 (Bridgehunter.com ID)

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  • Mott Bridge (Downstream) - Three modern bridges between structures


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