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Scope/Content: Abstract: Over the past 100 years, the United States led the world in dam building--blocking and harnessing rivers for a variety of purposes, including hydropower, irrigation, flood control, and water storage. The US Army Corps of Engineers (Army Corps) has catalogued approximately 75,000 dams greater than six feet tall along the waterways of the United States1 -- and at least tens of thousands of smaller dams plug our rivers across the country. (The National Research Council estimates that the number of US dams is over 2.5 million.2) US Secretary of the Interior Bruce Babbitt recently observed, "that means we have been building, on average, one large dam a day, every single day, since the Declaration of Independence."3