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Clearwater Lake (British Columbia)
Clearwater Lake is one of six large lakes in Wells Gray Provincial Park in east-central British Columbia, Canada. The Clearwater River enters the lake at its north end, flowing from Hobson Lake and Azure Lake, and also drains the lake. There are several small streams that flow into Clearwater Lake, but it has no significant tributaries.〔Neave, Roland (2015). ''Exploring Wells Gray Park'', 6th edition. Wells Gray Tours, Kamloops, BC. ISBN 978-0-9681932-2-8.〕
==Formation==
The basin occupied by Clearwater Lake was scoured by glaciers during several ice ages, including the Wisconsin Ice Age which ended in this region about 10,000 years ago. The basin subsequently filled with meltwater and, today, the greatest depth is near Diver's Bluff. When Dragon Cone erupted about 8,500 years ago, the lava flowed southwest to the Clearwater River, damming it to a height of and raising the level of existing Clearwater Lake just upstream. This flow is just one example of volcanic activity that has occurred in the Wells Gray-Clearwater volcanic field during the last 500,000 years.〔(Catalogue of Canadian Volcanoes - Wells Gray - Clearwater volcano field )〕〔Hickson, Cathie with Hollinger, Jason (2014). ''Wells Gray Rocks''. Thompson Rivers University, Kamloops, BC〕
Osprey Falls occurs where the Clearwater River empties out of Clearwater Lake. The waterfall is the height of the lava dam, but is over wide along an L-shaped brink. Osprey Falls is very hazardous to boaters on Clearwater Lake because of the strong current in the southern . Up to 2003, 18 people had been swept over Osprey Falls and only three survived.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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