How deep was Lake Mead when it was full?

The deepest point in Lake Mead ever recorded was about 590 ft (180 m) below the water's surface. This depth was reached in the early 1980s when the lake was at its maximum capacity. Since then, due to drought and increased water usage, the water level in Lake Mead has dropped significantly.



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At maximum capacity, Lake Mead is 112 miles (180 km) long, 532 feet (162 m) at its greatest depth, has a surface elevation of 1,229 feet (375 m) above sea level, has a surface area of 247 square miles (640 km2), and contains 28.23 million acre-feet (34.82 km3) of water.

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Lake Mead's water levels were the highest they have ever been in 1983. Water levels were so high at that point, that it was actually overflowing.

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Lake Mead's water levels were the highest they have ever been in 1983. Water levels were so high at that point, that it was actually overflowing. A picture taken on July 5, 1983, shows an aerial view of the Hoover Dam, at a time when Lake Mead was overflowing into the side spillways.

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In July 1983, Lake Mead reached storage capacity and its highest point in history at 1225 feet.

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As crazy as it sounds, engineers say the idea is technically feasible. It would involve building a system of dams and pipelines to move the water uphill across multiple states over the Continental Divide. Gravity would then work in our favor to drop the water down to the Colorado River watershed.

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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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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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As of May 31, 2022, Lake Mead held 26.63% of full capacity at 7.517 million acre-feet (9,272,000 megaliters), having dropped in June 2021 below the reservoir's previous all-time low of 9.328 million acre-feet (11,506,000 megaliters) recorded in July 2016, and never returning to that level.

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Lake Elevation Lake Mead began filling in late 1934 and the average daily surface elevations from 1 February 1935, when elevation data began to be collected, through 2009 are shown in Figure 2. The reservoir did not reach 1,045 ft above msl, the elevation of the upper outlet, until 1 May 1937.

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Under the Probable Minimum scenario, Lake Powell's physical elevation is projected to be 3,572.23 feet on December 31, 2023. With intervening flows between Lake Powell and Lake Mead of 1.31 maf in calendar year (CY) 2023, Lake Mead's physical elevation is projected to be 1,065.01 feet on December 31, 2023.

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“While the amount of precipitation received in the lower basin and from tributary inflows helps, the greatest source of water for Lake Mead is still snow melt and flows from the upper basin.”

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Hoover Dam, a concrete-arch gravity dam, captures water from the Colorado River and fills Lake Mead. At capacity (1,221.4 feet above sea level), the lake is the nation's largest reservoir, able to contain 28.9 million acre-feet of water covering about 248 square miles.

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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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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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Officials have warned that dead pool could be reached by 2025, if the lake continues drying up at the rate it is currently.

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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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Still, the drought deficit is so large, experts say the West would need four or five more years of snowmelt like this year's to really fill up Powell and Mead.

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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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The Lake Mead problem could be resolved by draining Lake Powell and storing the water in Lake Mead. More than 5% of the water in the Colorado River evaporates off the surface of Lake Powell - which never should have been built.

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