I asked Matti about that run and we think the bottom is the sketchy part. The majority of it should be free of wood though I'm not sure about the bridges. I'd like to bike scout down then drive back up for the run.
On the river, I can abandon who I am and what I've done. However brief it lasts, while on the river I am nothing important and everything insignificant. I am flotsam, and happy to be so.