I'm assuming that when you say "drift only" that you mean rivers that prohibit motorized vehicles???

Washington State has no rules or regulations governing the use of motorized boats but it would seem that the time is ripe. The folks that use motorized boats on the Oly Pen rivers can run into issues with the locals, but some folks may not know the local rules.

As a drift boat owner and sled owner, I would welcome entire rivers and/or sections of rivers where motorized boats are prohibited but I doubt the laws will change anytime soon.