Lake Powell, USA37.0N 111.2W
Lake Powell is a reservoir on the Colorado River, appearing here as a black band straddling the reddish lands of the border between Utah and Arizona.
It is the second largest man-made reservoir in the United States, storing 24,322,000 acre feet (30 km³) of water when full.
Lake Powell was created by the flooding of Glen Canyon by the controversial Glen Canyon Dam.
Lake Powell serves as a storage facility for the Upper Basin states of the Colorado River Compact (Colorado, Utah, Wyoming, and New Mexico).
The Compact specifies that the Upper Basin states are to provide a minimum annual flow of 8.23 million acre feet (10 km³) to the Lower Basin states (Arizona, Nevada, and California).