Dont mess with the river gods!!! I think BD is always class IV if you can drag a boat down it.
Class grading is all relative to the person, I ran that streatch 50+ times last spring/ summer, from 1500, to 11 k . Then I got my ass kicked at a low run in October.
I have no idea about the class V thing,, at really high water, everyone takes Mercy,, and that is not V. Down the gut has to be but whos going to do that.
Ihave seen someone run left center at around 11k. Does anyone know about that line?