For the third time since 1996, officials plan to unleash a manmade flood in the Grand Canyon next month in an effort to restore an ecosystem that was altered by a dam constructed on the Colorado River decades ago. The Glen Canyon Dam, completed in 1963 upstream from the Grand Canyon, permanently changed the Colorado River, transforming it from a warm, muddy, unpredictable force of nature into a cooler, clearer, tightly controlled water-delivery system. Without spring floods to flush the system and help rebuild beaches and fish habitat, native species suffered even as non-native fish thrived. The shift helped speed the extinction of four fish species and push two others, including the endangered humpback chub, near the edge.

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