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Portage Glacier Lake
As glaciers inch their way along, they typically push rocks, gravel, and
powdered rock (flour) into a long mound called a moraine. When the glacier
recedes, the melt water is trapped by the moraine, and a lake forms.
Icebergs floating in the lake are chunks that break off the glacier
as it melts in the summer. Perhaps Portage or one of its neighbors
dug the trench that is now the Turnagain Arm of the Cook Inlet.
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