brd -
If you ask this question it means that you have not run it in low water. The bottom line is that unless you have a 14-16' flat bottom boat and really know the river, it is not wise to run any of the stretches at less than 12'. All the sections have spots that are hairy if you know them, doable if you're an expert on them and potentially disasterous if you don't.
I ran the lower end in my 22' Willie Predator on Sunday morning at about 11.8 and will not be doing that again. Bumped the impeller twice (nothing serious thankfully) and scared the heck out of the dog. Scared the heck out of me too as I had to take lines that in higher water would be avoided because of things like boat eating rocks being right next to them.
The channels get very shallow and very narrow. Hard to pick out at speed, coming down stream especially.
If you don't care about your equipment, go for it. But you may want knee, elbow and head gear in addition to your PFD for when the boat stops and you don't...