Raging Ice Age floodwaters carved spectacular features throughout eastern Washington, creating unique landscapes. Follow the path of the floods and discover more about this amazing story.
Gouging Deep CouleesThe powerful floods cut steep-walled canyons, called coulees, including Frenchman Coulee, Moses Coulee, Potholes Coulee, and the largest of them all, Grand Coulee.
Are You a Landscape Detective?
Rocks, plants, and landscape features provide us with many clues about the Ice Age floods and other stories of the area's past. What do the small lakes, called plunge pools, at the base of the cliffs tell you?
(left photo caption)Grand Coulee is up to 800 feet deep and more than one mile wide in some places. Photo by Bill Correll
(center photo caption)Ice Age floods carved Steamboat Rock, a streamlined basalt mesa in Grand Coulee about 30 miles north of here. Photo by Bob Carson
(right illustration caption)A plunge pool is a deep depression scoured out by the force of water tumbling over a cliff. Today, these lakes and ponds are fed by groundwater.

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Show me all markers in:  Coulee City, WA  |  Grant County  |  99115  |  Washington  |  United States of America

World's Greatest Waterfall... Without Water!
In the Path of Cataclysmic Floods
Dry Falls
Story of Dry Falls
History of the Stratford Area
History of the Steamboat Rock Area
Early Days in Ephrata
Welcome to Grand Coulee Dam Historical
Grand Coulee Dam
Franklin Delano Roosevelt Historical

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