where there is a joining of water ways is even better. the place we went is a place where the bed rock showed and you could see where the raw material came from. we have maybe 5000 pieces. i use to talk to old timers way back when and they would tell me about skipping them down the road at night to see the sparks.
I haven't been arrowhead hunting in years, the wife and I used to go all the time. I don't know how many I have but I would say over a thousand. We should post some pics.