Modified level II streambed-scour analysis for structure I-70-141-4972 crossing Greens Fork in Wayne County, Indiana

Level II scour evaluations follow a process in which hydrologic, hydraulic, and sediment transport data are evaluated to calculate the depth of scour that may result when a given discharge is routed through a bridge opening. The results of the modified Level II analysis for structure 1-70-141-4972 on Interstate 70 crossing Greens Fork in Wayne County, Indiana, are presented. The site is near the town of Jacksonburg in the west-central part of Wayne County. Scour depths were computed with the Water Surface PROfile model, version V050196, which incorporates the scour-calculation procedures outlined in Hydraulic Engineering Circular No. 18. Total scour depths at the piers were approximately 23.0 feet for the modeled discharge of 8,900 cubic feet per second and approximately 28.1 feet for the modeled discharge of 11,500 cubic feet per second.