I need to determine the scour depth at my abutments for a single span bridge replacement. The existing and the proposed bridge both function under pressure flow. The attempt was to keep the existing bridge and approach roadway as close to the existing as possible. I need to use the FHWA Hydraulic Toolbox to determine my scour depths and if I understand correctly I need to obtain most of my information for that program from the HEC-Ras model. When I look at my internal bridge cross section upstream, it is showing blanks for the hydraulic depth and top width in my channel and LOB. Any ideas what is wrong? Any help would be greatly appreciated. Thanks!