FILE - In this March 3, 2020, file photo, a dam on the Lower Klamath River known as Copco 2 is seen near Hornbrook, Calif. A new agreement announced Tuesday, Nov. 17, 2020, promises to revive faltering plans to demolish four massive hydroelectric dams on a river along the Oregon-California border to save imperiled salmon by emptying giant reservoirs and reopening hundreds of miles of potential fish habitat that's been blocked for more than a century. (AP Photo/Gillian Flaccus, File)
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