I like this description so much that I’m going to quote it in full here
as seen on the source page:
Middle Fork of the American River
Sierra Nevada Mountains
Placer County, California.
“Torrents of freshly melted snow churn wildly and roar unabated through deep canyons in the upper reaches of the Sierra Nevada Mountains. The water is so cold and so pure that it produces a wild bluish-green color in its depths, yet is perfectly clear as it bubbles and splashes through the rapids. “
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