How long would it have to rain to refill Lake Mead?

It causes catastrophic flooding, and much of the water runs off rather than soaking into the land or filling reservoirs. About 60% of the area still is in drought. It would actually take six more years of heavy rainfall in a row to refill the Lake Mead reservoir completely.



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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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Lake Powell and Lake Mead - the nation's largest reservoirs - are unlikely to refill for another 50 years and would need six consecutive years of deadly atmospheric rivers to replenish, experts say.

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The Bureau of Reclamation announced that the country's largest and second-largest reservoirs, Lake Powell and Lake Mead, saw improved water levels but recovery back to a full pool is a long way away, if ever.

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Since 1983, years of drought along with high water demand have caused the lake to drop by 132 feet. Today, the lake is at only 30% capacity, its lowest level since it was built in the 1930s. Fortunately, heavy rainfall early in 2023 has relieved the situation a little, but only temporarily.

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Did Tropical Storm Hilary Affect Lake Mead Water Levels? Lake Mead's water levels, at a record low last year due to ongoing drought, rose a bit during heavy rainfall from Tropical Storm Hilary. But rain isn't the lake's primary source of water.

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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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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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When the snow eventually begins to melt, gravity will take over. As the water flows down from higher elevations, it begins a long journey that does not end at Lake Mead. According to the Las Vegas Valley Water District (LVVWD) the water will slowly seep into the ground.

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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.

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The vast reservoir's water level has dropped more than 170ft (52m) since 1983, the same year the Colorado River flooded the dam's spillways. Over-extraction, extreme heat and decreased snowmelt have burdened the Colorado River Basin and nearly 40 years later, Lake Mead is down to about 27% of its capacity.

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The last time Lake Mead was at maximum capacity, reaching an elevation of about 1,220 feet near the dam, was in 1983 and 1999, NASA notes.

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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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The amount of water that melted off and made its way into the river system was enough for the Bureau of Reclamation to release far more water from Glen Canyon Dam at Lake Powell this year, which means more water flowing downstream into Lake Mead.

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Arizona, California and Nevada are proposing to voluntarily save at least 3 million acre-feet of water in Lake Mead through 2026, over and above any other water cuts to which we've previously agreed. That's enough over three years to cover the entire city of Phoenix in more than 9 feet of water.

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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.

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