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New Cornelia Tailings of Pima County, Arizona is one of the largest mine tailings piles in the world: 7.4 billion cubic feet, the New Cornelia Tailings is often cited as the largest dam structure in the country, by volume (the tailings, waste material from the mining process, were heaped into a pile that created a holding structure for future tailings, some of which were deposited in a pumped slurry, thus the tailings pile is an "impoundment" or dam). The mine that produced the tailings, the 1.5 mile wide open pit New Cornelia Mine, is owned by Phelps Dodge, and is presently in limbo (shut down in 1983). A project to mine the tailings has been proposed. The next in size is the Fort Peck Dam, 21,430 ft (6,531 m) long and 250 ft (76 m) high, on the Missouri River, NE Mont.; one of the world's largest earth-filled dams.

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16y ago
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7y ago

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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15y ago

The biggest dam in the United States is Hoover Dam!!

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16y ago

The Grand Coulee Dam - Grand Coulee, Washington

* Length 5,223 ft * Height 550 ft

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14y ago

I believe it is the Oroville Dam in California.

The largest dam is the Hoover..but it is not earth dam.

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11y ago

It is the hoover dam.

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3y ago

The largest dam built with fill and mixed materials in the United States is the Fort Peck Dam in Montana, with about 96,000,000 cubic meters of fill. The largest concrete dam in the Unites States is Grand Coulee dam in Washington State, with about 9,155,000 cubic meters of concrete. This compares to the 4,360,000 cubic meters of concrete used in Hoover Dam, which has about half as much concrete as Grand Coulee Dam.

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3y ago

The largest earth dam in the United States is the Fort Peck Dam in Montana. It contains more than 125,000,000 cubic yards of material. The second largest is Oroville dam in California, which has approximately 78,000,000 cubic yards of material. The largest concrete dam in the United States is Grand Coulee dam, which has about 12,000,000 cubic yards of concrete. This is more than two and a half times the amount of concrete in Hoover Dam.

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Q: What is the largest earth dam in the us?
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What are the top ten largest earth dams in the US?

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