Thank you for the reply Christine, I am attempting to run the Create Drainage Line Structures tool but I am getting Error 000358: Invalid expression even though I am not generating a custom expression. Here is the Python code for my parameters within the tool. arcpy.archydropro.CreateDrainageLineStructures("DEM_NW_Grid", "NHD_Clip", r"G:\Projects\County Hydro\GIS_Data\County_Hydro_Test\County_Hydro_Test.gdb\FdrStr", r"G:\Projects\County Hydro\GIS_Data\County_Hydro_Test\County_Hydro_Test.gdb\StrLnk", r"G:\Projects\County Hydro\GIS_Data\County_Hydro_Test\County_Hydro_Test.gdb\DrainageLine", r"G:\Projects\County Hydro\GIS_Data\County_Hydro_Test\County_Hydro_Test.gdb\DrainageLine_FS", r"G:\Projects\County Hydro\GIS_Data\County_Hydro_Test\County_Hydro_Test.gdb\EditPoint", "CLEAR_ANGLES_YES", "USE_RASTER_EXTENT_FALSE", None, 11.6)
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