GRAND CANYON, Ariz. — Archaeological sites along the Colorado within Grand Canyon National Park and Marble Canyon show significant degradation from releases at Glen Canyon Dam according to a recently released report by the U.S. Geological Survey.
Over the last decade the condition of the majority of archaeological sites along the Colorado River within Grand Canyon National Park and Marble Canyon have deteriorated largely because of imbalances in the natural sediment cycle according to a new lidar monitoring report by the U.S. Geological Survey.
The completion of Glen Canyon Dam in 1963 fundamentally altered the characteristics of the Colorado River by slowing and stabilizing the flow of nearly 40 million people’s source of water...