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NCHRP Web-Only Document 83 (Project 24-14): Contractorâs Final Report and Appendix A Scour at Contracted Bridges Prepared for: National Cooperative Highway Research Program Submitted by: C.R. Wagner, D.S. Mueller, A.C. Parola, D.J. Hagerty, and S. T. Benedict U.S. Geological Survey and University of Louisville Louisville, Kentucky March 2006