Lake Mead Hits Record Low as Colorado River Crisis Worsens

Lake Mead, the largest reservoir in the United States, has reached its lowest water level since it was filled over 90 years ago. According to federal data reported by The Guardian, PBS, and TimesLIVE, the lake's elevation dropped to 1,040.3 feet above sea level on Sunday, surpassing the previous record low of 1,040.58 feet set in July 2022.

The historic low follows a winter that produced the worst snowpack on record in the Colorado River Basin. Melting snow from this basin feeds the river, which supports over 40 million people across seven U.S. states, tribal nations, and Mexico. The dwindling water levels are a stark indicator of the crisis plaguing the Colorado River system.

Federal officials have proposed short-term measures to address the crisis after states relying on the river failed to reach an agreement on long-term sharing of the dwindling resource. Under this proposal, California, Arizona, and Nevada would share water cuts. The Bureau of Reclamation reports that Lake Mead has continued to drop every day this month.

Years of overuse combined with severe drought and rising temperatures have significantly depleted both Lake Mead and Lake Powell, the country's second-largest reservoir. Together, these two reservoirs are at their lowest levels in nearly seven decades. To protect hydropower production, federal officials announced they will not release cool water from Glen Canyon Dam to preserve the habitat of a threatened native fish.

The severe drought has also had other impacts, including exposing human remains and forcing Las Vegas water officials to pump water from deeper within the reservoir to continue supplying millions of people. The Trump administration's management plan for the Colorado River calls for reassessing the situation in two years. Experts have warned that the federal proposal might not be enough to solve the problems facing the imperiled river.

Of the 54 western reservoirs tracked by the Bureau of Reclamation, nine recently recorded their lowest levels in the last three decades. According to modeling done in July, Lake Mead is forecast to continue dropping through much of the rest of the year.

The dwindling supply at Lake Mead puts hydropower at risk as the latest figures show it’s not far from the 1,035-foot operational threshold: when elevation drops to this level, some turbines at Hoover Dam will have to shut down, and its generation capacity would drop by 70%. A July 2026 forecast from the Bureau of Reclamation shows that Lake Mead water levels could come close to that threshold in the next few months and could fall below that by spring next year.

Arizona Gov. Katie Hobbs strongly pushed back against the federal proposal, calling the cuts "unacceptable," potentially setting up a political battle. The situation in the Colorado River Basin is just one among a handful of water reservoirs in the U.S. where water supply has significantly declined.