— the cliff the flood ran over.
“A four-hundred-foot cliff and a three-and-a-half-mile horseshoe scar at the head of the lower Grand Coulee, with small lakes standing in the plunge basin at the foot. The cliff is the dry remains of what was, during the last ice age, the largest known waterfall on Earth. The water that ran over it was the Missoula Floods, the same outburst floods that carved the channeled scablands to the east. At peak flow it carried roughly ten times the discharge of all the world's rivers combined. The waterfall has been dry since the floods ended around fifteen thousand years ago.
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Dry Falls is a 3.5-mile-wide horseshoe-shaped cliff at the head of the lower Grand Coulee in central Washington, in Grant County north of Soap Lake. The cliff is roughly four hundred feet high at its tallest point, with small lakes standing in the plunge basin at its foot. The Dry Falls Visitor Center sits on the cliff rim along State Route 17, about two miles south of the small town of Coulee City. The cliff and the coulee below it sit inside Sun Lakes-Dry Falls State Park. The landform is the dry remains of what was, during the last ice age, the largest known waterfall on Earth.
The water that carved Dry Falls was the Missoula Floods, a series of catastrophic outburst floods that crossed eastern Washington between roughly fifteen and eighteen thousand years ago. Glacial Lake Missoula in present-day western Montana broke its ice dam dozens of times. The floodwater backed up behind constrictions, ponded in the Quincy Basin, and over-spilled the basalt rim at this point to plunge into the lower Grand Coulee. At peak flow the discharge at Dry Falls is estimated at around sixty-five million cubic feet per second, roughly ten times the combined flow of all the world's rivers. The falls were 3.5 miles wide and four hundred feet high, more than ten times the width and twice the height of Niagara.
The Dry Falls Visitor Center sits on the cliff rim at the edge of State Route 17, about two miles south of Coulee City. The centre has a wide observation deck looking south over the falls and the lakes in the plunge basin, and an interpretive exhibit on the ice-age floods. It is open daily from mid-May through September with reduced winter hours. The state park below the falls has camping, swimming, and trails around Park Lake and Deep Lake. A Washington Discover Pass is required for state-park parking. The clearest light on the cliff face is in late afternoon, when the western sun crosses the rim and the basalt columns throw long shadows into the basin.