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There's an explaination on one of the signs at one of the stops along hwy 20.

If I remember correctly, Ross Lake (and nearby Diablo Lake) is so blue because of the glaciers slowly moving and grinding the rocks and minerals beneath it over time into a rock flour which is carried and deposited by the melting ice into the lake(s) and down river. The mineral that gives it the pretty blue color is called gneiss.

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Q: Why is Ross Lake in the North Cascades so blue?
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