Why is Lake Mead disappearing so fast?

The main contributors to Lake Mead's decreased water levels, besides population growth leading to depletion, include drought and climate change. Lake Mead and surrounding areas have been plagued by drought over the last few years. For instance, 83% of Colorado is experiencing drought at this moment.



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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.

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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.

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Lake Mead's water level continues to fall to historic lows, bringing the reservoir less than 150 feet away from “dead pool” — so low that water cannot flow downstream from the dam. The loss of water entirely from this source would be catastrophic.

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If the water levels dip much lower, the Colorado's northernmost reservoir won't have enough in the tank to both fill Lake Mead downstream and generate any hydropower, which would have devastating effects on the electricity grid in the western US.

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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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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.

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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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Mead reaches dead pool at 895 feet. If Lake Powell reaches dead pool, the US Bureau of Reclamation—which declined our interview requests—would be unable to meet its obligation to deliver water downstream to Lake Mead. In which case, 40 million people would be affected.

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Scientists are holding human-induced climate change responsible for the Colorado River Basin's loss of more than 10 trillion gallons of water — or about the entire storage capacity of Lake Mead — over the past two decades.

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1 inch = 2 billion gallons. Over seven days (Aug. 20-27), the lake gained about 13 and a half inches – 27 billion gallons. The increase at Lake Mead is because releases from Glen Canyon Dam – 280 miles upstream on the river – have increased.

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Record snowfall in the West wasn't enough to alleviate drought impacting Lake Mead. The record snowfall in the West wasn't enough to permanently alter the course of the drought impacting Lake Mead. FOX Weather's Robert Ray reports on the ongoing water issues and the Colorado River.

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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. The WY 2023 unregulated inflow into Lake Powell in the August Probable Maximum inflow scenario is 13.75 maf, or 143% of average.

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It is the largest reservoir in the US in terms of water capacity. Lake Mead provides water to the states of Arizona, California, and Nevada as well as some of Mexico, providing sustenance to nearly 20 million people and large areas of farmland.

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“When we see even significant rainfall in the Las Vegas Valley and the benefit to Lake Mead from that rainfall and all of that runoff, you are looking at, at best, tenths of an inch in changes.

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But that heavy rainfall likely had little effect on Lake Mead's water levels. This weekend brought nearly a monsoon season's worth of precipitation in just a few days. But that heavy rainfall likely had little effect on Lake Mead's water levels.

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