Photo: NASA Marshall, 2017 Photo
Wikipedia: Lake Powell is a reservoir on the Colorado River, straddling the border between Utah and Arizona (most of it, along with Rainbow Bridge, is in Utah). It is a major vacation spot that around two million people visit every year. It is the second largest fabricated reservoir by maximum water capacity in the United States behind Lake Mead, storing 24,322,069 acre feet (3.0000830×1010 m3) of water when full. However, due to high water withdrawals for human and agricultural consumption, and because of subsequent droughts in the area, Lake Powell is currently larger than Lake Mead in terms of volume of water currently held, depth and surface area.