I am reading on this site about finding old dumps. We have quite a few creeks and rivers, and I know where the old railroad bed was at, dating pre 1870. I do not have a clue where to start looking. I was thinking about going to a creek and walk near the river, keeping my eyes peeled for old bottles, old glass, pottery shards etc. I do not have a probe yet, how easy is it to find a dump by carefully observing the ground by the creek? Also how close to the creek or river are the dumps usually found? There are also some old train trestles nearby, I have noticed one guy on here digging around the trestles and finding bottles. If you were a beginner with these options where would you start and how?