During this time the glacial ablation regime was dominated by melting and a large outwash stream flowed from the glacier to Turnagain Arm. Portage Lake, approximately 5 km long, 2 km wide and 200 m deep, began to form in 1914 after the glacier retreated off the 1852 AD moraine.
In geology — where things are measured in millennia — Portage Lake is barely a blink in Alaska's existence. The lake first appeared only in 1914 and, in the century since, it's rapidly retreated five miles towards the mountains.
Skiers must take appropriate precautions near Portage Glacier, as the constant movement of the glacier's calving face breaks up even thick lake ice and can create patches of open water or unstable ice near the glacier's face, even in midwinter.
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