August 22, 2025 — While a controversial southern Oregon dam may delay the migration of a threatened species of salmon, the impact isn’t significant enough to violate federal environmental laws, a federal judge in Portland ruled on Thursday.
“This court concludes that plaintiffs have not proven by a preponderance of the evidence that defendant is liable for ‘take’ of Oregon Coast coho salmon under the Endangered Species Act,” U.S. District Judge Karin Immergut wrote in the 35-page findings of fact and conclusions of law.
A coalition of environmental conservation groups and fisheries organizations led by WaterWatch of Oregon sued the Winchester Water Control District in 2020, accusing the district of violating the Endangered Species Act through its operation of the Winchester Dam on the North Umpqua River. The groups argued the dam causes illegal take of Oregon Coast coho salmon by blocking access to spawning habitat and attracting fish to impassable areas of the dams with leaks.
“This is a disappointing decision, but it doesn’t change the fact that coho salmon are listed under the Endangered Species Act and Winchester Dam needs to come out,” Jim McCarthy, WaterWatch’s southern Oregon program director, said in a statement. “It’s a flawed and outdated dam and the court recognized the dam has significant issues. Our campaign to remove the dam continues.”