Abstract
The design and construction of the Old 99 (Riverside) Bridge in Washington State is described in this article. The bridge, which won a 2004 PCI Design Award, is 850 feet long and 72 feet wide, and the five-span, post-tensioned, spliced-girder bridge spans the Skagit River. The bridge superstructure was designed by the Washington State Department of Transportation in supergirder sections. Precast concrete sections were transported to a staging area close to the site, then spliced into single girder sections and erected onto piers with no intermediate temporary supports. High performance concrete (HPC) was specified for the cast-in-place splices. Special attention was given to the lateral stability during erection.
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