LOWELL GEORGIA / SCIENCE PHOTO LIBRARY LOWELL GEORGIA / SCIENCE PHOTO LIBRARY
Hoover Dam across the Colorado River below the Grand Canyon, completed in 1936, it is 1,244 feet long and 726 feet high, making it the highest dam in the USA. The hydro-electric power station below the dam has a power generating capacity of 1 million kW from its 18 generators. The reservoir stores 30 million acre-feet of water in Lake Mead which extends 115 miles up the river.
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