I would not think so, as long as the Jon boat is average size or better. I would also want more than one source of power, just in case. 6,700 CFS is alot of water, as I am sure you are well aware. Under two gens, there are a couple of spots with whitewater, due to the rock ledge shelves. I was with some guys that floated it in a standard Riverhawk and had no problems at all. Best of luck.
Troutfix