Imho the higher up in the mountains, the more blue rivers and lakes look (unless they carry mud). Something to do with optics.
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I'm not sure it's optics
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I've looked at lakes higher up than here in Mammoth, CA, and they were nowhere near as blue...
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Perhaps smolten ice water as opposed to whatever source CA lakes get water from?
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I think it's it!!
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I *think* the altitude thing is a variable but solutes and suspended particles also affect hue. Mountain ice melt + insoluble rock ~ bluuuue
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disclaimer: IANAGOH (geologist or hydrologist)
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Interesting...
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What minerals are these? Why is it so blue?! 