Mad Creek, Steamboat, Colorado
Many glacier-fed streams experience a change in flow not only through the season, but through the day as well. Why? During the day, high temperatures and solar radiation melt team up to melt the mountaintop ice, only relenting when that side of the earth leaves the sun in favor of cold, dark night. But when the sun rises again, more of that beautiful clear water swells downhill towards the rivers and oceans beyond. So if you ever need to cross a glacial river, it might be easier at night. Actually, nevermind. That sounds freaking cold.
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