Lake Powell
Why in News?
On 15–17 August 2026, Lake Powell’s surface dropped to about 3,519.9 feet above sea level, its lowest water level ever recorded.
Geography & Formation
- Location: Stretches across the border of southeastern Utah and northern Arizona in the United States.
- Origin: Created as a man-made reservoir by the construction of the Glen Canyon Dam in 1963, which flooded Glen Canyon.
- Size: It is the second-largest reservoir in the United States by water capacity, trailing only Lake Mead.
- Water Source: Primarily fed by the Colorado River, collecting snowpack runoff originating from the Upper Colorado River Basin.
Ecological & Economic Role
- Water Bank: Acts as a vital water storage system supplying drinking water and agricultural irrigation to over 40 million people across seven states and dozens of tribal communities.
- Power Grid Anchor: Houses the Glen Canyon Dam hydroelectric turbines, which provide clean electricity to millions of homes and businesses across the American Southwest.
- Water Quality: Characterised as an oligotrophic reservoir, meaning it has low nutrient concentrations, low algal growth, and famously clear water.
- Tourism Hub: Part of the Glen Canyon National Recreation Area, normally attracting around two million vacationers annually for boating, houseboating, and canyon exploration.
Critical Water Thresholds
- Full Pool (3,700 feet): Represents the maximum capacity, holding over 24 to 26 million acre-feet of water.
- Minimum Power Pool (3,490 feet): The level where the water becomes too low to spin the dam’s power-generating turbines.
- Dead Pool (3,370 feet): The ultimate worst-case scenario where water falls below the dam's outlet tubes, preventing any water from flowing downstream entirely.
