I'm trying to use a elevation raster to create a new routed stream line, but I can't believe how stuck I am. I went through Fill, Flow Direction, Flow Accumulation, and Con to get a raster the stream lines as the highest accumulations in my AOI. Then I used Raster to Polyline and got a polyline shapefile of the streams from which I selected the one stream line I want to analyze and made a new shapefile. But when I start an edit session, select the stream line, and try the Make Route tool, I get "No accptable target available. Make Route creates M aware polylines." Is my problem that I have a polyline not a line shapefile? I can't find a way to convert polylines to lines.
I'm just trying to create some pairs of stream measure and elevation to give to a colleague in a spreadsheet. I did it once with some routed lines I already had, but wanted to run it again on a stream line directly from the elevation raster.