I ran into a dozens and dozens of them on DNR land north of Sinlahekin Wildlife Area. It was insane actually. I was focused on getting closer to some deer and not listening. was glassing and moving from tree to tree. I then "woke up" and heard a rattle. I stopped and then listened. Well I was surrounded by rattlers. Literally. It took me an hour or so to walk out of there! Made it w/o getting bit but wow.