Hello! I am biologist who has been teaching himself how to use arcmap. My place of employment just gave me a simple task, create a map of a river, and find distances between sites that were sampled along the river. They provided written instructions, and I would like to complete the task over the weekend. ' Right now I am stuck on the route editing tool. When I try to use make route, it states that there are no acceptable targets, make route creates m aware polylines. Can anyone provide me the solution to this problem? I acquired flowline data from NHD, which I have been using as the base for my map.