I've drift boated the small Skook with 'Fly before, and at average flow we still had part of the boat go under branches just to make it thru a couple narrow slots. This is no place for a jetsled, at all! You can say this is America, the land of the free, but that does NOT mean free to do obviously dangerous and menacing acts that disturb the peace for others. I think the act of running a sled up creeks would fall under at least a couple other juristictions other than the WDFW. Likely against the generalized rules and safety rules of boat operation of the state marine board. Likely also the local law enforcement rules of general safety and keeping the peace. Someone let the guys knows what's up before they try to start a very bad trend! And alert those authorities quickly by cell phone the next time you see one coming. Good luck with it.

RT