At what water level will Lake Mead stop producing power?
The water elevation in Lake Mead is around 1,040 feet above sea level. At 950 feet, Hoover Dam will be at its lowest point to be able produce power, according to the US Bureau of Reclamation.
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If the reservoir dips below 895 feet (272.8 meters) – about 150 feet (45 meters) lower than where it is now – Lake Mead would reach what's called dead-pool level. Dead pool is when water in a reservoir drops so low that it can't flow downstream from the dam.
How long does Lake Mead have left? Lake Mead has been facing a water crisis for many years. The water level in the lake has been dropping due to the increasing demand for water and the decreasing supply. If the trend continues, the lake could run out of water in the next 10 to 15 years.
Electricity would not just be the only thing lost. Without Lake Mead, Las Vegas would lose access to 90 percent of its water sources. If Lake Mead were to reach dead pool, it would technically still be able to supply drinking water to Las Vegas. But there will not be enough water for agricultural activities.
Key Points. Lake Mead has dropped by 70% due to droughts in the West and it will take many years to refill again, naturally. The reservoir is vitally important to millions of people as a source of water, electricity, and recreation.
It supplies about 25 million people with water in Boulder City, Las Vegas, North Las Vegas, and Henderson, all Nevada's cities. In addition to cutting off water supplies for homes and businesses in the area, a dam collapse would destroy all the irrigation water supplies for farms in the Imperial Valley.
However, it is important to note that the Hoover Dam is a critical infrastructure, and shutting it down would be unlikely unless it's an emergency situation or for maintenance purposes. For more information on how the Hoover Dam works and the effects of it potentially shutting down, keep reading.
Powell's physical elevation is projected to be 3,574.30 feet on December 31, 2023. With intervening flows between Lake Powell and Lake Mead of 1.32 maf in CY 2023, Lake Mead's physical elevation is projected to be 1,065.42 feet on December 31, 2023.
Even massive storms like those that hit over Labor Day weekend only contribute what amounts to a fraction of an inch of increased water levels at Lake Mead, said Paul Miller, a hydrologist with the National Weather Service's Colorado Basin River Forecast Center in Salt Lake City.
But that heavy rainfall likely had little effect on Lake Mead's water levels. The reservoir sat at about 1,063.4 feet in elevation when the rains started on Friday. By Monday night, it had ticked up to 1,063.8.
“While the amount of precipitation received from the recent storms in the lower basin and from tributary inflows helps, the greatest source of water for Lake Mead is still from snow melt and flows from the upper basin — especially from good winter snowpack from the west slope of the Rocky Mountains,” Hendrix said.
It would actually take six more years of heavy rainfall in a row to refill the Lake Mead reservoir completely. Time is ticking to solve the problem before future droughts dry up the lake completely. Without irrigation, farmland like this in California and other western states would revert to the desert.
As mentioned, it's possible for the water level in Lake Mead to drop to the point where the dam cannot generate hydroelectric power. However, it's very unlikely that the lake would completely run out of water.
Lake Mead's water levels currently stand at 1,050.71 feet as of May 8. According to a Maximum Probable Inflow 24 month report released in April 2023, Lake Mead's water levels could rise to 1,060.30 feet by the end of July 2023. This, in other words, is a best-case scenario for the drought-stricken reservoir.