Down Cottonwood on Roaring Fork
There is a rather large cottonwood down across the left channel between El Jebel and Catherine's Store, about halfway down. Water was flowing over it when we went by, but it forms a rather large drop, and it was not much. As flows drop, that's going t get uglier. No good place to portage either. You can't really see it until you are right on it. It comes after the river bends to the right.
There wasn't much in the way of landmarks (and I am not familiar with the area), but on a map, it is just after Arlian Road. The current wants you to go to the left channel, but there is a right channel so when in doubt stay right.