All work associated with removal of the first of four hydroelectric dams slated for demolition on the Klamath River completed in early November, according to the dam owner, Klamath River Renewal Corp. Demolition of the four dams on the Klamath River that flows through parts of Oregon and California is the largest dam removal project in U.S. history.

The dismantling of Copco No. 2, a 35-ft concrete diversion dam in California, is a milestone for project advocates, who include local tribes concerned about destruction of the habitat for once plentiful salmon and steelhead trout populations in the Klamath River basin.