SA Guide: Hummocks trail
"Vancouver, Vancouver, this is it!"
That was the astonished cry of David Johnston as he watched the beginning of what was to become the largest landslide in recorded history. An entire flank of the south-central Washington peak the vulcanologist was monitoring calved off of its north side and, at speeds of up to 150mph, roared toward his station six miles away on what is now called Johnston Ridge.