Grand Coulee lower lake

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Water rushed through the canyon during the floods that were released out of ancient Lake Missoula.

Grand Coulee

The Grand Coulee is an ancient river bed in the U.S. state of Washington. This National Natural Landmark stretches for about 60 miles (100 km) southwest from Grand Coulee Dam to Soap Lake, being bisected by Dry Falls into the Upper and Lower Grand Coulee.

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