Built between 1956 and 1966 amidst a great deal of controversy, the Glen Canyon Dam is a concrete arch built on the Colorado River in northern Arizona near Page. It is 710 feet high, creating Lake Powell, the second largest artificial lake in the USA.
In 1983, major floods nearby nearly led to the dam’s collapse. The dam remains controversial despite providing power and steady water from the upper to the lower basins of the Colorado River. Most of Glen Canyon’s colorful and beautiful gorges are now under water and the dam is responsible for major physical and ecological changes.