Modified level II streambed-scour analysis for structure I-74-70-4437 crossing Eagle Creek in Marion County, Indiana

Level II scour evaluations follow a process in which hydrologic, hydraulic, and sedimenttransport 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 1-74-70-4437 on Interstate 74 crossing Eagle Creek in Marion County, Indiana, are presented. The site is near the town of Clermont in the northwestern part of Marion 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 16.0 feet for the modeled discharge of 22,700 cubic feet per second and approximately 31.7 feet for the modeled discharge of 31,600 cubic feet per second.