All depends on how bony ya want it. I know we've done upper through lower at .6ft, which I think ended up being in the 100-120 range. All went, but you had to push through Green Bridge (under the bridge). Lower was fine at that level as was Upper. I think we were on White Line doing laps at 80cfs or something this spring. That looked bony on Middle, but probably doable. Lower should go. I've been told by friends that they've run the upper through lower at 65cfs.
If you just want to get on the water, there's enough. If you're wanting real excitement, it's probably not there. And if you're looking for rock dodging and limited line choices, you're all set!
"Basic research is what I am doing when I don't know what I am doing." -- Werner von Braun