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The Conversation
The Conversation
Farshid Vahedifard, Professor of Civil and Environmental Engineering, Tufts University

West Coast levee failures show growing risks from America’s aging flood defenses

Days of heavy rain caused a levee on the White River to breach, sending water into Pacific, Wash., on Dec. 16, 2025. Brandon Bell/Getty Images

In recent weeks, powerful atmospheric river storms have swept across Washington, Oregon and California, unloading enormous amounts of rain. As rivers surged, they overtopped or breached multiple levees – those long, often unnoticed barriers holding floodwaters back from homes and towns.

Most of the time, levees don’t demand attention. They quietly do their job, year after year. But when storms intensify, levees suddenly matter in a very personal way. They can determine whether a neighborhood stays dry or ends up underwater.

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