shoshone at these levels is still class III. it is big, it is intimidating, but there are no obstacles to maneuver, little if any technical nature to it. keep it pointed down river and everything should be just fine.
i see few people running it at these levels. BUT, i have seen very unprepared people. no wetsuits, pounding beers before getting on the water, out of shape large people, etc...
a swim their will not be fun, but everything flushes