On a spring morning in 1996, then–Interior Secretary Bruce Babbitt stood at Glen Canyon Dam, a concrete bulwark in Arizona that holds back the Colorado River to form Lake Powell. During a live broadcast on the Today show, a popular national TV program, Babbitt opened valves to unleash an unprecedented experimental flood into the Grand Canyon just downstream. As onlookers applauded, water gushed from gaping outlet pipes. Babbitt called the experiment, which was testing one way of restoring Grand Canyon ecosystems damaged by the dam, the start of “a new era” in environmental management.