What will happen to Las Vegas if Lake Mead gets too low?

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.



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Indeed, if the reservoir drops below 895 feet, it is considered a “dead pool” condition, which will jeopardise the Hoover Dam's ability to provide electricity – leaving nearly 1.3 million people in Arizona, California, and Nevada without power.

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Lake Mead and Lake Powell, major reservoirs along the river, could reach “dead pool,” with levels so low that water can't flow out of those dams. That could turn off river supplies to cities like Las Vegas, Los Angeles, and Phoenix.

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Lake Powell and Lake Mead are unlikely to refill for another 50 years - and would need SIX consecutive years of deadly atmospheric rivers to replenish.

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As drought continues to afflict the American West, the dire situation at Lake Mead will continue to have consequences for states like Arizona, California, and Nevada that draw their water supply from Lake Mead.

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LAS VEGAS (KLAS) — Television and social media videos of raging floodwaters after Tropical Storm Hilary lead the public to ask, “Does all that water help?” The answer is complicated, but officials say Hilary's direct effect on Lake Mead was “minor” and had more to do with reduced demand than anything else.

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What happens if Lake Mead dries up forever? If Lake Mead were to run out of water, the Hoover Dam would no longer be able to generate power or provide water to surrounding cities and farms. The Colorado River would essentially stop flowing, and the Southwest would be in a major water crisis.

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One year later, Mead's elevation is inching back up. A combination of historic winter snowpack and new federal agreements to pay cities, farmers and tribes to conserve water are expected to raise Mead to a high point of 1,070 feet in February 2024, according to the most recent federal data.

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With the reduced sediment input into Lake Mead, the lifetime of the reservoir has been extended to potentially more than a thousand years.

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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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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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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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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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Studies show that a project like this would be possible, though it would take decades of construction and billions of dollars. Maybe even trillions.

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