slide
Here's a very small picture taken from about the 2700' outlook on the Benton Trail into the ravine. I don't think this would be the route of the old trail but the red arrow points to an overgrown slide. In reducing this to fit the 100K limit, I overdid it! If the slide could be in the right place and you want to see it larger, I can upload it to webshots.
Also, here's a post on VFTT on 1-17-2004 by theswissfactor, who climbed the Tunnel Brook Ravine in winter 2002:
"I've eyed this trip [something in the Fran. Notch] for some time, but never realized it would be as exciting as it seems it was. Now I'm desperate to do it. There is a tremendous amount of potential for random gully bushwacks in the Whites. I climbed Tunnel Brook Ravine on Moosilauke two winters ago, and it's one of the most memorable hikes I've done in NH."
If you want to see a good aerial view of the old slide in Little Tunnel Ravine, look at vol. 2 of The Moosilauke Reader, p. 560. The author, Ballard (1937), says this:
"Some of these slides were caused at the time of the 1927 flood....Descent of the mountain by way of the Tunnel Slide, which is a difficult scramble even for active people, is an impressive lesson in how mountains are worn away."
The aerial view inclines me to believe that my little picture does show a part of the overgrown slide in question.