Bernie,
I have personally seen several rattlers up on Slate Run. They do reside there! I've seen them on rocks in the middle of the run and on the path! So be careful if you go up Slate Run. Also, I have seen copperheads just above Petticote Junction near the old railroad bridge. One was swimming in Pine creek the other was sunning on rocks near abutment.
Make enough noise and they will avoid you. Ron