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In page Climate change in Washington:

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In the North Cascades National Park, experts estimate that some streams get about half of their late-summer flow from glaciers.[citation needed] Since 1959, the glaciers have lost 80% of their ice, and in Thunder Creek specifically, receding glaciers reduced summer streams on a whole by 31%.[citation needed] At Mount Rainier National Park the mountain's glaciers lost 21% of their area between 1913 and 1994, and in Olympic National Park, glacier retreat has been recorded for Blue Glacier as well as others.