EPA report: Dams play large role in raising water temperatures
The EPA issued a report Tuesday detailing summertime water temperature problems on the lower Snake and Columbia rivers and assigning significant responsibility to federal dams. The report said dams on both rivers play a role in raising water temperatures above 68 degrees — the state water quality standards of Washington and Oregon, and the point at which the water becomes harmful to salmon and steelhead. The causes of the increasing water temperatures are known as Total Maximum Daily Load, or TMDL. A draft TMDL is now out for public comment through July 21, 2020.