Grand Canyon Flooding

When the Glen Canyon Dam became operational in 1963, it changed the flow of the Colorado River, eliminating spring floods that had roared through the region's canyon country for centuries. Last year the dam was opened, sending water through the Grand Canyon for one week. Now, scientists are studying the river to see whether the flood restored the river ecosystem. In this hour of Science Friday, we'll look at the effects of the flood, and at the most endangered rivers in the U.S.

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