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How was Lake Chelan formed in the North Cascades?
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Pacific mountain system
Coast Mountains along the Torres Channel, an arm of Atlin Lake, northwestern British Columbia, Canada.
Lake Chelan, located in the Cascade Range of Washington, was formed through the process of glaciation. The lake occupies a deep, narrow valley that was carved by glaciers, resulting in its characteristic fjordlike appearance.12
This glacial carving is a common geological feature within the Pacific mountain system, where the movement of ice has shaped the landscape and created numerous lakes throughout the region. Today, Lake Chelan remains one of the deepest lakes in the United States, reaching a depth of 1,486 feet (453 meters).21