Qualla: Columbia River Plateau

Columbia River Plateau: Introduction

Wed, 21 Jan 2026 00:00:00 GMT

Photo credit CC BY-SA 3.0. Fly over eastern Washington and the land tells its own story in frozen lava and scoured rock. Between 6 and 17 million years ago, flood after flood of volcanic basalt buried nearly 64,000 square miles of the Pacific Northwest under flows up to a mile thick. Then, at the end of the last ice age, something stranger happened: Glacial Lake Missoula burst its ice dam repeatedly, sending walls of water down the Columbia Gorge that dwarfed every river on Earth combined. The channeled scablands they carved remain - dry coulees with vertical basalt walls, massive ripple marks visible only from the air, and Dry Falls, where water once dropped over a cliff five times wider than Niagara. Today, irrigation has turned the desert green; dams generate enough hydropower for entire cities; and the same geology that created the scablands now produces some of America's finest wine.

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Image: CC BY-SA 3.0

Columbia River Plateau: Floods Beyond Imagination

Wed, 21 Jan 2026 00:00:00 GMT

Photo credit Steven Pavlov, CC BY-SA 4.0. Geologist J Harlen Bretz spent decades defending a theory that seemed too outlandish to accept: that the bizarre landscape of eastern Washington had been carved by catastrophic flooding. The scientific establishment resisted until aerial photography revealed the truth. The Channe...

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Image: Steven Pavlov | CC BY-SA 4.0

Columbia River Plateau: Power and Transformation

Wed, 21 Jan 2026 00:00:00 GMT

Photo credit Andrew Filer from Seattle (ex-Minneapolis), CC BY-SA 2.0. Grand Coulee Dam is the largest concrete structure in the United States and among the largest hydroelectric producers in the world. Built during the Depression, it transformed the Columbia from a wild river into a managed system of reservoirs and generating stations. The power it...

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Image: Andrew Filer from Seattle (ex-Minneapolis) | CC BY-SA 2.0

Columbia River Plateau: Wine and Water

Wed, 21 Jan 2026 00:00:00 GMT

Photo credit WiiUser23 at English Wikipedia, CC BY-SA 3.0. The same basalt that created the scablands creates ideal conditions for viticulture: rocky, well-drained soils that stress grapevines into producing intensely flavored fruit, plus long summer days and cool nights on the high plateau. Walla Walla and the Yakima Valley have emerged...

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Image: WiiUser23 at English Wikipedia | CC BY-SA 3.0

Columbia River Plateau: A Land of Extremes

Wed, 21 Jan 2026 00:00:00 GMT

Photo credit Williamborg, Public domain. Summer temperatures routinely exceed 100F in the Tri-Cities; winter can bring subzero cold and occasional heavy snow. Rattlesnakes are common outside developed areas. The plateau offers some of the most dramatic geology in North America - from the hexagonal basalt columns at Fren...

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Image: Williamborg | Public domain