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The largest concrete structure in the U S is Grand Coulee Dam in Washington state. Not as tall as Hoover Dam, but it is 5223 feet across the top. Compared to 1244 feet for Hoover. Hoover Dam has a volume of 3,250,000 cubic yards. Grand Coulee has a volume of 11,975,520. Power generation, Grand Coulee is 7079 MW. Making it the sixth largest producer in the world. Hoover's production is 2050KW. Ranking it at 36 world wide.

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