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.
Path of Least Resistance
As floodwaters rushed across eastern Washington, they followed existing rivers and streams until they overwhelmed them They then found their own way toward the ocean, going over or around large obstacles and carving new routes wherever they could.
Are You a Landscape Detective?
Landscape features provide us with many clues about the Ice Age floods. What do the shape of the Palouse Hills across Highway 261 tell us?
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When temporary Lake Lewis pooled behind Wallula Gap, most of the Pasco Basin region, including the Tri-Cities and Sacajawea State Park, was under hundreds of feet of water.
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Lyons Ferry Park, located at the confluence of the Snake and Palouse rivers, provides opportunities to see more Ice Age floods features, including great view of Palouse River Canyon.
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These streamlined hills were sculpted by Ice Age floods. Although not obvious at ground level, their tear-drop shape point in the direction of the floodwaters.