Intresting topic. I spent some time looking it up and Idaho has no "fly fishing only waters".. there are bait restictions in several places and single barbless hook restrictions in some places, but no "fly fishing only water"... I used to be a fly fishing only guy, until I realized that there was a lot more out there. I would think it would un-constitutional to impose a fly fishing only rule on public water ?? However, WSR is not about fly fishing... lots of people think its a good idea who don't even own a fly rod