Glacier National Park - TheSiggins

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McDonald Creek Potholes
Potholes are formed by fast-flowing water swirls where fragments of stones and pebbles carried by the river whirl around, drilling circular depressions into the river bed. The flowing water keeps the fragments in motion, constantly wearing away the sides of the depressions. These gradually become deeper and wider to become potholes.

Glacier NPMontanaLakes Streams and Waterfalls