Map showing the locations of the Bridge and Marble Canyon Dams proposed by the US Bureau of Reclamation in the 1950s, to dam the Colorado River in the Grand Canyon. The dams were part of the Pacific Southwest Water Plan whose ultimate goal was to...

Map showing the locations of the Bridge and Marble Canyon Dams proposed by the US Bureau of Reclamation in the 1950s, to dam the Colorado River in the Grand Canyon. The dams were part of the Pacific Southwest Water Plan whose ultimate goal was to import water into the Colorado River basin from the north. After a long controversy they were never built.

(Source: commons.wikimedia.org)