Dan Bacher, DAILY KOS
For many years, federal, state and corporate proponents of building more dams in California have touted cold water river releases provided by increased water storage behind dams as a key tool in “saving” struggling salmon and steelhead populations.
Yet a just published study by the UC Davis Center for Watershed Sciences, Dams Ineffective for Cold-Water Conservation – 8/25/21, has found that dams are ineffective for the cold water conservation that is needed to preserved imperiled salmon, steelhead and other fish species.
”Dams poorly mimic the temperature patterns California streams require to support the state’s native salmon and trout — more than three-quarters of which risk extinction,” according to the study published in the journal PLOS ONE by the University of California, Davis. “Bold actions are needed to reverse extinction trends and protect cold-water streams that are resilient to climate warming.”
The study helps identify where high-quality, cold-water habitat remains to help managers prioritize conservation efforts.
“It is no longer a good investment to put all our cold-water conservation eggs in a dam-regulated basket,” said lead author Ann Willis, a senior staff researcher at the UC Davis Center for Watershed Sciences and a fellow for the John Muir Institute of the Environment. “We need to consider places where the natural processes can occur again.”