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Not easy to answer. The Golden Gate Bridge weighs under 900,000 tons, the Hoover Dam weighs 6.6 million tons. The Grand Coulee Dam weighs about one-third of 70 million tons.

By my own calculations, a cube of solid concrete which is one thousand feet long, one thousand feet wide and one thousand feet high, would weigh around 70 million tons.

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∙ 14y ago

What else can I help you with?