Boat fishing regulations are a little bit tricky. Under the standard "Special Gear Regulations" one cannot fish from a motor boat. On the Skagit mainstem that was modified so that one cannot fish from a motor boat with the motor running. This was a waiver created because boon-dogging was the most popular method for drift fishing with conventional steelhead gear, where the old Skagit scows were controlled by an oarsman with a set of "sweeps" (oars) as the boat drifted down through a piece of water. Nowadays with jet sleds equipped with a main jet powered motor, a gas kicker, and an electric, they might be SOL if they don't have a set of oars to use while drifting and fishing, but you cannot use a motor while fishing under Special Gear Regulations.

As for the Sauk, anglers are (or were) allowed to fish from drift boats or rafts, but not a boat equipped with a motor. WDFW cannot regulate navigation, so some folks have run jet boats (me included) up the Sauk and then got out and bank fished. A caveman however, would sit on a log, or maybe a dugout canoe, and fish from that . . .