4658 x 3304 px | 39,4 x 28 cm | 15,5 x 11 inches | 300dpi
Date de la prise de vue:
22 août 2022
Informations supplémentaires:
The natural-color images on this page show portions of Lake Powell in the summers of 2017 and 2022, as observed by Landsat satellites. The Operational Land Imager on Landsat 8 acquired the 2017 images, while the Operational Land Imager-2 on Landsat 9 acquired the 2022 images. Lake Powell straddles the border of southeastern Utah and northeastern Arizona; most of the area shown is in Utah. (For a year-by-year view, visit the Earth Observatory feature World of Change: Water Level in Lake Powell.) The August 2017 images were chosen because they represent one of the highest water levels from the past decade. On August 16, 2017, the water elevation on the lake, as measured at Glen Canyon Dam, was 3, 633.04 feet. On August 6, 2022, it stood at 3, 535.38 feet, nearly 98 feet lower. The animated line plot below shows water levels at the dam since 1980, when Lake Powell was nearly full. The red line marks “minimum power pool elevation”; below that water level, hydroelectric turbines at the dam can no longer generate energy effectively.
