Glen Canyon and Lake Powell

The walls of Glen Canyon seem a bit taller when Lake Powell’s water levels are low, as evidenced by a telltale “bathtub ring” rising from the surface. The enormous lake’s levels fluctuate with rainfall and snowmelt. 

Droughts during much of the 21st century’s first decade reduced the lake to nearly half capacity. But even at low levels the nation’s second largest reservoir holds a tremendous amount of water—Lake Powell contains a staggering 1.2 trillion cubic feet (33 billion cubic meters).

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