Lake Mead Water Levels Could Fall 20 Feet Below Record Low
Lake Mead’s water levels, which are already at historically low levels, could fall 20 feet below the record in the summer of 2027, new federal projections indicate after a poor snow season and continuing tensions over Colorado River operating agreements.
According to projections released Friday by the U.S. Bureau of Reclamation (USBR), Lake Mead’s water levels could drop to 1,020 feet by July 2027. The lowest recorded level was in 2022 at around 1,040 feet.
Lake Mead, the largest reservoir in the U.S., supplies drinking water to around 25 million people across a number of western states, and its levels have become a central barometer of the region's long-term water security. Further declines would not only deepen water shortages but threaten hydropower generation at Hoover Dam and intensify tension around water use in the region.
The reservoir, located in Nevada and Arizona and formed by the Hoover Dam on the Colorado River, has faced mounting pressure in recent years, from prolonged drought and warming temperatures, to reduced mountain snowpack affecting snow-water levels.
The USBR’s projections show that Lake Mead’s water levels would be at 1,050 feet by the end of this month, down 6 feet from the end of April. It is 7 feet lower than levels in May last year, and levels are forecast to continue declining until July 2027, before seeing some increase after the summer of 2027.
By April 2027, water levels are forecast to be below 1,035 feet, which reportedly would have significant implications on the Hoover Dam’s hydroelectric power generation.
Eric Witkoski, executive director of the Colorado River Commission of Nevada, told the Las Vegas Review-Journal that when the water level falls to 1,035 feet above sea level, only five of the dam's 17 turbines can generate power. When operating normally, the dam can produce enough power to serve 1.3 million people in Nevada, Arizona and California.
The latest forecast is also lower than other recent projections by the USBR, which earlier this year predicted that Lake Mead's elevation would drop to 1,036 feet at the end of November 2027. Now, the USBR believes water levels that month will be 10 feet lower.
Concern around water levels at Lake Mead have amplified this year as a federal deadline to agree on a plan for water use in the Colorado River has been missed on multiple occasions.
States in the Upper Basin, which includes Colorado, Utah, Wyoming and New Mexico, argue that they already use less than their legal entitlement and should not bear additional cuts, while Lower Basin states-Arizona, California and Nevada-face mounting pressure to reduce consumption further as reservoir levels fall.
The current guidelines, last updated in 2007, are set to expire at the end of this year, and without a new plan, the water security of seven states hangs in the balance.
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This story was originally published May 18, 2026 at 10:34 AM.