Bad River Canyon

Yes, there are folks who have gotten into the canyon and made this run. The 'featured video' (mentioned in a comment below, and listed in the 'Quick Facts' above) begins with multiple runs of Wren Falls, then progresses to the lead-in, Copper Falls, and the canyon. (Wren Falls is on Tyler Fork which is a tributary of the Bad River which (many miles later) cascades over Brownstone Falls toward the end of the gorge and towards the end of this video.)