Modified level II streambed-scour analysis for structure I-70-60-5180 crossing Branch of McCracken Creek in Hendricks 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 1-70-60-5180 on Interstate 70 crossing Branch of McCracken Creek in Hendricks County, Indiana, are presented. The site is near the town of Center Valley in the south-central part of Hendricks 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 12.4 feet for the modeled discharge of 1,200 cubic feet per second and approximately 24.8 feet for the modeled discharge of 2,040 cubic feet per second.