cool... just wondered since a friend of mine was up in the hills above Greenwater and happened across some yahoos firing off a few rounds, so he was wondering the same.
there used to be two gravel pits along FR 70 where people would target practice freely... that was until some dad killed his son because he didn't verify that no one was down range before firing, and his kid happened to be downrange checking ot the target. It was accidental, and a tragic accident... seems like it was probably 5+ years ago, or so.
I think for safety's sake it's a good idea to maybe program the USFS ranger office's phone number in yer cell phone, though no one may be there to answer the phone on weekends, but write down license numbers, or photograph them casually so the yahoos don't see you doing said photographing, then report them to the law enforcement or forest service. Naches (FR19) has regular patrols by Yakima county deputies as well as USFS LE staff.