Chehalis Lake
Template:Short description Template:Infobox lake Chehalis Lake is a lake on the Chehalis River in the Lower Mainland of southwestern British Columbia, Canada. It lies in the Chehalis Valley Script error: No such module "convert". east of Vancouver.[1][2]
Name
Chehalis Lake and the Chehalis River — which the lake feeds to its south — share the name with the community of Chehalis, British Columbia, which is the home of the Sts'Ailes people, a Halqemeylem-speaking Coast Salish group.Script error: No such module "Unsubst". The name Sts'Ailes is said to mean "beating heart."Script error: No such module "Unsubst". (The similarly named Chehalis, Washington, and Chehalis River in the United States are named for a word in the Chehalis language with a different meaning: "sand.")Script error: No such module "Unsubst".
Recreation
During the summer, Chehalis Lake is a popular location for camping, recreational fishing, and hiking.[3]
History
Formation
Chehalis Lake is a glacial-trough lake formed in the Pleistocene by the advance and subsequent retreat of the Cordilleran Ice Sheet.[3]
2007 landslide and megatsunami
On December 4, 2007, a rockslide with a volume of Script error: No such module "convert". slid down the side of Script error: No such module "convert". high Mount Orrock on an east-facing slope. The slide began at an altitude of about Script error: No such module "convert". as a mass of quartz diorite and traveled for Script error: No such module "convert". down the slope, disintegrating into a debris avalanche and reaching a speed of Script error: No such module "convert"..[1][2][3] It destroyed a Script error: No such module "convert". section of a forest service road and about Script error: No such module "convert". of commercially marketable timber.[1]
The slide reached the western shore of Chehalis Lake, depositing a large amount of material in a Script error: No such module "convert". deep portion of the lake.[1][2][3] This generated a megatsunami with a run-up height of Script error: No such module "convert". on the opposite shore,[3] Script error: No such module "convert". away.[2] The wave was Script error: No such module "convert". tall at the lake's exit point, Script error: No such module "convert". away to the south.[3] The wave then continued down the Chehalis River for about Script error: No such module "convert"..[1][3] Along the lakeshore, the wave stripped vegetation to heights of as high as several tens of metres, caused significant erosion of sediments, and severely damaged three deserted campgrounds.[1][2] The event occurred during the winter when cold weather deters visits to the lake, so there were no eyewitnesses to it or deaths or injuries resulting from it.[3]
The cause of the landslide is not clear. Heavy snow and rain in the area prior to the slide may have been at least a contributing factor.[2]
One model suggests that the slide deposited perhaps Script error: No such module "convert". of material in the lake, and that if the entire Script error: No such module "convert". had entered the lake the megatsunami's maximum run-up height would have been Script error: No such module "convert"..[3]
References
Citations
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Bibliography
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