April 5, 2019 — Environmental groups urged a judge to order immediate changes to the government’s operation of a series of dams in the upper Willamette River basin, saying steelhead and Chinook salmon are too imperiled to risk waiting for litigation over dam operations to play out.
The Army Corps of Engineers operates a series of 13 dams in the upper Willamette River and its tributaries. The dams provide flood control, produce electricity and store water for irrigation and for the city of Salem, Oregon. The dams are also the main cause of the precipitous decline of upper Willamette steelhead and Chinook salmon.
But the government hasn’t acted to protect fish, environmental groups say.
In 2008, the National Marine Fisheries Service issued a biological opinion finding that the dams were decimating the protected fish by killing the majority of young salmon and steelhead as they make their way past the dams toward the ocean. The dams also torpedo water quality by raising water temperature to deadly levels and force young fish to cross reservoirs filled with predators and parasites.
In its biological opinion, National Marine Fisheries Service said the Corps could continue to operate the dams while reducing impacts to fish if it immediately implemented a slew of measures to improve fish passage and water quality.
But the Corps didn’t do that, and fish populations continued to decline.