A lot of areas you can get a boat to would probably be near the big gravel bars with the alder patches. From what I've seen they like to sleep or night feed out on areas like that. Then feed up the hill in the morning and head back to the flat open areas in the evening. For the early bow muzzy season overlapping the rut, you might get the whole herd down on the gravel bars all day long. I think that is why most of the guys that would use the boat method would hunt in from the road and then launch the boat if they got something. They liked the driftboats because they could drag them up on the bar and tilt them on the side, then tie the elk to the boat and right it. The elk would slide right in. Able to get the animal out whole and just row down to the next take out.