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Mt. Meager Landslide [1]
Canada

The 2010 Meager Creek slide is the largest recorded slide to date in Canada's history and one of the largest slides world-wide since 1945.  In the early morning of August 6, 2010, a large rock fall off the secondary peak of Mt. Meager onto the heavily saturated south side resulted in a massive slide of rock and debris to barrel down Capricorn Creek and into Meager Creek and the Lillooet River valley below.  Meager Creek was completely filled with debris.  The slide was so enormous that it filled the creek and ran more than 270 meters up the opposing valley wall.  Gravity pulled the slide back down to the valley floor, carrying a wall of debris both upstream and downstream almost 13km from where the slide originated.  The wall of debris destroyed approximately 6km of resource roads and two major bridges, both of which provided the only access to the popular Meager Creek Hot Springs.

The slide blocked Meager Creek, and partially blocked the Lillooet River, for approximately 19 hours.  Subsequently, the Lillooet River saw a 10-15 meter rise in water level, and Meager Creek flooded the valley behind the wall of debris; 2.9 million cubic meters of trapped water created a lake several kilometers long.  Due to fears the debris dam could fail and result in the sudden release of the backed-up water, approximately 1,500 residents downstream of the slide in the Pemberton Valley were immediately evacuated.  Luckily, the natural gradual release of the pooled water lessened the fears of flooding and residents were able to return home.

Although there were recreationists and industry workers in the area, there were no injuries or fatalities.  The number of people in the area at the time of the slide was drastically less than usual thanks to data received via a weather station that was installed by the Ministry of Forests, Lands and Natural Resource Operations earlier that year.  That data gathered from the station prior to the slide indicated a safety risk and promptly the ministry to shut down access to the valley, ultimately saving numerous lives.

Although the Meager Creek valley was closed by the ministry, several pumice mine employees working in the Upper Lillooet valley became trapped behind the debris flow which crossed the Upper Lillooet Forest Service Road severing their only access out of the area.  They were eventually rescued without incident.  Prior to the closure, a few campers set up at the Upper Lillooet Campsite and were there when the slide started.  By driving up a side road and out of harm's way they narrowly escaped behind caught in the slide.  They too were rescued unharmed.  The debris flow caused damage to areas frequented by wildlife and to spawning grounds for salmon.  After the slide, the B.C. Forest Service and Fisheries and Oceans Canada worked cooperatively to ensure the affected spawning grounds were protected.  The slide's direct impact and cost is estimated to have been approximately $10 million.  The damage caused from the 2010 Meager Creek slide and changes to the surrounding landscape will remain visible and serve as a reminder of nature's power for many decades to come.

Source: Meager Creek landslide info sign

Copyright: William L
Art: Spherical
Resolution: 20756x10378
Taken: 22/09/2016
Hochgeladen: 22/09/2016
Aktualisiert: 06/01/2019
Angesehen:

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Tags: mount meager; british columbia; coast mountains; pacific ranges; landslide; canada; lillooet river; volcano; plinth peak; ruins; silt; rock flour
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