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Twisp River Bridge - Okanogan County, WA |
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The Twisp River Bridge is one of the first applications of the use of the WSDOT "super girders" that were developed in recent years. Constructed with segmental post-tensioned I-girders, this bridge provides a clear span across the Twisp River in the north-central region of Washington State.
The 95" deep x 196' long girders, assembled from three segments of 44.63', 101.39', and 44.63', were supported on temporary shoring over the river while closure pours were cast in the joints between each segment. The cast-in-place deck was then constructed and the girders were post tensioned.
Segmental construction was chosen for the girders because the remote site location precluded transporting single-piece girders of that length and weight (235,000 lbs).
| An article published in the March/April 2002 issue of the PCI Journal explains more. |
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Products
Precast Prestressed Girders - W95PTMG Girders - 12 @ 44'-8", 6 @ 101'-5"
Features
Long Span - Long span design presents minimal interference with river flows and fish habitat.
Segmental Construction - Segmental construction allowed a long span bridge to be constructed in a remote location.
Credits
| Owner |
Washington State Department of Transportation |
| Designer |
Washington State Department of Transportation |
| General Contractor |
One Way Construction, Sedro Wooley, Washington
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| Precaster |
Concrete Technology
Corporation, Tacoma, Washington
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