Glen Canyon Dam

Glen Canyon Dam

The Glen Canyon Dam collects the waters of the Colorado River to form 186-mile-long (300-kilometer-long) Lake Powell, a key piece in a river system that provides water to some 30 million people.

Dams intercept about 35 percent of Earth’s total river flows, and reservoirs cover as much ground worldwide as the state of California. The planet’s total reservoir water weight is so great it has slightly altered the speed of Earth’s rotation.

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