JIM STEINBERG / SCIENCE PHOTO LIBRARY JIM STEINBERG / SCIENCE PHOTO LIBRARY
Glen Canyon Dam. View of the Glen Canyon Dam on the Colorado River in Arizona, USA. The dam has a hydroelectric power station at its base. Electricity cables run from the power station to pylons on either side of the Canyon. Hydroelectric power is cheap and has relatively little environmental impact. The amount of power generated may be quickly increased by raising the flood gates. Hydroelectric power stations are commonly used during times of peak demand. The dam, built in 1956-64, is 215 metres high and 475 metres across. Its completion created Lake Powell, the water of which backs up along the Colorado River for 300 kilometres.
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