The fall of Hope (Hope Slide) occurred on January 9, 1965 at Hope, 135 km east of Vancouver, in the extreme southwest of Canada.
The landslide was the largest in Canadian history and costed four lives, though in an almost uninhabited area. He tore from a steep slope (> 45 °) just below a ridge in the Cascade Mountains and poured into a side valley of the Coquihalla River, which flows about 10 km further at Hope in the Fraser River. As local surveys showed, 46 million cubic meters of rock and boulders crashed down a slant slope inclined at about 20 ° and remained as a huge heap of 70 meters in height and three kilometers in length. According to Albert Heim's rule of thumb, the lintel on the slide had to have a speed of over 200 km / h.
The pebble avalanche completely drained a lake (Outram Lake) near the Nicolum River and moved the river. It also rolled a few miles off Highway 3 (a branch of the newly opened Trans-Canada Highway) that had to be closed for weeks.
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