The agencies will prepare a supplemental environmental impact statement analyzing new environmental data that a 2020 study, ...

Learn about physical characteristics of the Colorado River basin, including climate, rock type, soils ... selecting and developing a site for a dam, such as the geology of the area, valley ...

Both identify breaching the lower Snake River Dams located in Washington as the greatest opportunity to restore salmon and steelhead populations in the basin. The 2020 study, known as the Columbia ...