Here is a view looking down the central gully of Rattlesnake Canyon above Hwy 89 in the Wellsville Mountain Wilderness.  I estimate the deep pile of deposition to be around 3/4 of a mile long and up to 30' deep.  You can see the toe of the slide in the center of the picture, where the gully opens up into scrubby maple trees

What used to be a young stand of big-tooth maples is now a few sticks and a pile of snow.  From a little ways above the toe.  All that you see of the steep slopes above avalanched in one big event...

This was a high velocity powder avalanche, and it must have hit the bottom of the canyon with explosive force judging by the woody debris which was spread all over the place beyond the toe.

This is looking up the long deposition pile from near its top.

Its really hard to describe the devastation in the forest below Rattlesnake Canyon

Here is a small part of the crown near the summit of the 8500+' Mitten Peak.

All the slopes pictured here avalanched.  The crown-line near the ridge-top was well over a half-mile long.