No, the points are not all on the same stream segment or tributary, they are all over the place. But I do not need to know how each point relates to every other point, only how 3 or so relate to each other. Each point is the intersection of the edge of a lake and the streams layer. I need to find the point that represents the outlet of the lake, so that I can delineate a catchment. I would like to do this, essentially, by taking all points with the same LakeID and finding the one with the greatest flow accumulation.
Thank-you for your help, let me know if you need any more explanation.