Dry Falls in north-central Washington is the mother of all waterfalls. Or used to be. Flood water from a collapsed ice dam in Montana swept over these cliffs 15,000 years ago. Geologists believe it is the largest waterfall ever to exist. The basalt face is 400 feet deep and 3.5 miles long, five times wider than Niagara Falls. The plunge pools at the base were created by the ice-age flooding. Dry Falls is located 7 miles southwest of Coulee City. I stopped at the abandoned farm below earlier in the day.

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