Why? Here's one reason...
From the Mt. Bachelor thread:
Quote:
Originally Posted by bdog
A large slab broke off the Moraine on the NE aspect. The crown fracture was in excess of 5 feet leaving not much more than an inch cover on the cinder surface. The slide just missed the lower terminal of the Summit chair, swept over the small ridgeline and into, yes, Avalanche run and down Marshmallow. The full path of the slide traveled over a quarter mile, filled in gullies, took out numerous large fir and left a debris field with piles 12 to 15 feet deep mixed with broken fir. The path went into the major green run area. If this event had occured when the area was open it would have been really bad. As it was it happened late Wednesday night or early Thursday morning.