I was able to bring my handicap dad on my first sheep hunt in the Missouri Breaks. We did a 30 mile float in a little John boat. The roads dried up just in time and the rain held off just long enough to get out.
You cant use a powerboat from mid-may ( i think) to September first.
By hunting season you will need a small Jon, jet, or mud boat to go very far in the brakes, low water, rocks, and mud bars just under the water.