What is the biggest concrete dam in the World ?

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What is the biggest concrete dam in the World ?A. Three Gorges Dam
B. Tarbeela Dam
C. Grand Coulee Dam
D. Tehri Dam

For a time, Grand Coulee Dam was the largest concrete structure ever built, but today that distinction goes to the Three Gorges Dam in China, completed in 2009. It is roughly three times the size of Grand Coulee.