The U.S. Army Corps of Engineers (USACE) Portland District is seeking public input on a draft study that considers changes to how the agency operates its Willamette Valley dams.
This study – referred to as a Supplemental Environmental Impact Statement (SEIS) –builds upon a six-year study completed in April 2025 and addresses new requirements regarding endangered fish and hydropower production that emerged shortly before the six-year study was finalized.