What record-low water levels at the Hoover Dam reservoir look like from space - The Verge
Drought is sucking the US’s largest water reservoir dry. NASA released satellite images that show dramatic changes at the Hoover Dam’s Lake Mead.
The US’s largest water reservoir, Lake Mead at the Hoover Dam, is in very, very bad shape. How bad is it? New satellite images from NASA show just how much the reservoir’s footprint has shrunk over the past two decades — and the difference between July 2000 and July 2022 is stark.
Water levels at Lake Mead are at a historic low — the reservoir hasn’t been this empty since 1937 when it was being filled for the first time. It’s currently at just 27 percent capacity. The last time it was close to full capacity was 1999, just one year before the image on the left of the slider below was taken.
The water elevation at the Hoover Dam stood at a meager 1,041 feet on July 18th, 2022, according to the Bureau of Reclamation, which manages Lake Mead. That’s a scary number because, once it drops below 1,000 feet, it will affect the dam’s ability to operate its hydropower turbines. The dam typically provides power to 1.3 million people in Nevada, Arizona, and California.
That’s not the only trouble at Lake Mead. Last year, officials declared a water shortage there — the first time such a declaration had ever been made along the Colorado River system. Forty million people depend on the system for water across the southwestern US and northwestern Mexico. At the time, water levels at Lake Mead had dropped to 1,071.57 feet. The water elevation is already even lower than that and is predicted to drop another 20 feet by next summer.
Long-term drought made worse by climate change has sucked the reservoir dry. In the chart below, NASA plots out what that’s looked like over the past 2022 years. More than 80 percent of the Western US is currently “abnormally dry,” according to the US Drought Monitor. Well over a third of the region is coping with “extreme” or “exceptional” drought.
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