Will Lake Mead benefit from storms?

“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.



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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.

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“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.

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Rain runoff into the tributaries that eventually feed into Lake Mead contributed about 112,000 acre-feet more water than what the bureau projected, which accounted for about 1.6 feet of the reservoir's rise, Helms said.

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It would actually take six more years of heavy rainfall in a row to refill the Lake Mead reservoir completely.

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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.

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Lake Mead expected to have gained 20 feet of water by end of 2023. By the end of the year, the water level at Lake Mead is expected to be at least 20 feet higher than it was in January, according to a Bureau of Reclamation forecast released this week.

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Most of our rainwater travels untreated through gutters, storm drains, channels, washes and eventually into the major source of our drinking water - Lake Mead. All storm drains lead to lake mead. Stormwater that falls in the Las Vegas Valley picks up pollutants and travels untreated to Lake Mead.

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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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Despite hope that the lake will return to what it once was, Lake Mead's chance at a full recovery is slim. Jennifer Pitt, director of the National Audubon Society's Colorado River Program, previously told Newsweek that it is possible only if three years of average snowfall occur with no water use from the reservoir.

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Although Lake Mead has started to recover, it still has a long way to go before it is stable and healthy. After reaching record lows in 2022, Lake Mead has seen some signs of recovery in 2023 thanks to a precipitation-heavy winter that increased the snowpack throughout the Colorado River Basin.

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As of July 18, 2022, Lake Mead was filled to just 27 percent of capacity. The largest reservoir in the United States supplies water to millions of people across seven states, tribal lands, and northern Mexico.

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Under the Probable Maximum scenario, Lake Powell's physical elevation is projected to be 3,583.38 feet on December 31, 2023. With intervening flows between Lake Powell and Lake Mead of 1.35 maf in CY 2023, Lake Mead's physical elevation is projected to be 1,066.20 feet on December 31, 2023.

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