National Mall floodgate may get first test if Hurricane Irma hits DC

WASHINGTON (WUSA9) - After Hurricane Katrina brought the Crescent City to its knees and floodwaters filled the basement of the National Archives in Washington only months later, authorities in the nation’s capital came up with a solution to shield national treasures from Potomac storm surge.

The Army Corps of Engineers built a stone, steel and concrete wall 10 feet tall at its highest point, visible from the Washington Monument and World War II Memorial. It crosses 17th Street N.W., the heart of the National Mall.

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