The accelerated bridge construction project that replaced the U.S. 6 bridge over Keg Creek in Pottawattamie County in 2011 closed the road for 16 days instead of the roughly six months that were estimated by Iowa DOT, which would have been required with conventional construction. The bridge was completely prefabricated off-site, which made the project a demonstration of accelerated bridge construction techniques that were developed through the federal Strategic Highway Research Program. It was the first project of its kind in Iowa and was described by the Federal Highway Administration as a first in the United States for completely prefabricating the new bridge system off-site and installing it at the crossing.
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