Postcard from Mrsriley in Montana (actually, it's from Mrs. Riley's grade five class)
Description: Lower Falls. Standing 208 feet high, Lower Falls is Yellowstone National Park's highest waterfall. During the height of the runoff period, usually in June, some 63,500 gallons of water per second are estimated to pass over the Lower Falls. The green color of the water that extends partway down the falls is caused by a notch in the riverbed at the top of the falls. It allows the river to retain some of its natural color instead of immediately breaking into spray.
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