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Grant, Magilligan, and Doyle have a different theory, however.
Dams may get the recreational label, Doyle says, “when we have no idea what they are for now, and we can’t stitch together what they were for when they were built.” But while many of the original uses have disappeared, the dams have not.
This became the PNJ Interchange, “the seed of the electricity grid as we know it,” explains Martin Doyle, a professor of river science and policy at Duke University.
Yet only 3% of dams in the US are hydropower facilities—together supplying about just under 7% of U. “The West developed through the construction of dams because it allowed the control of water for development,” says Emily Stanley, a limnologist at the University of Wisconsin, Madison.But for most dams, none of these are their primary purpose.Nearly one-third of dams in the national inventory list “recreation” as their raison d’être, a rather vague description.The falls are now covered in 100 feet of water at the bottom of the reservoir behind the Dalles Dam.Hundreds of archaeological sites, going back 10,000 years, dot the riverbanks and the walls of the Grand Canyon.