Modified level II streambed-scour analysis for structure I-69-16-5324 crossing Fosters Branch in Madison 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 1-69-16-5324 on Interstate 69 crossing Fosters Branch in Madison County, Indiana, are presented. The site is near the town of Ingalls in the southwestern part of Madison 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 8.0 feet for the modeled discharge of 1,600 cubic feet per second and approximately 12.8 feet for the modeled discharge of 2,720 cubic feet per second.