The hydropower dams on the Columbia River flooded villages, disrupted economies and ways of life and continue to harm people indigenous to the Pacific Northwest, according to a first-of-its-kind federal report released Tuesday. The hydropower dams on the Columbia River flooded villages, disrupted economies and ways of life and continue to harm people indigenous to the Pacific Northwest, according to a first-of-its-kind federal report released Tuesday. Ecology Phys.org – latest science and technology news stories