U.S. officials on Monday declared the first-ever water shortage from a river that serves 40 million people in the West, triggering cuts to some Arizona farmers next year amid a gripping drought.
Water levels at the largest reservoir on the Colorado River — Lake Mead — have fallen to record lows. Along its perimeter, a white “bathtub ring” of minerals outlines where the high water line once stood, underscoring the acute water challenges for a region facing a growing population and a drought that is being worsened by hotter, drier weather brought on by climate change.
States, cities, farmers and others have diversified their water sources over the years, helping soften the blow of the upcoming cuts. But federal officials said Monday’s declaration makes clear that conditions have intensified faster than scientists predicted in 2019, when some states in the Colorado River basin agreed to give up shares of water to maintain levels at Lake Mead.
“The announcement today is a recognition that the hydrology that was planned for years ago — but we hoped we would never see — is here,” said Bureau of Reclamation Commissioner Camille Touton.
Lake Mead was formed by building the Hoover Dam in the 1930s. It is one of several man-made reservoirs that store water from the Colorado River, which supplies household water, irrigation for farms and hydropower to Arizona, California, Colorado, Nevada, New Mexico, Utah, Wyoming and parts of Mexico.
But water levels at Lake Mead and Lake Powell, the river’s two largest reservoirs, have been falling for years and faster than experts predicted. Scorching temperatures and less melting snow in the spring have reduced the amount of water flowing from the Rocky Mountains, where the river originates before it snakes 1,450 miles (2,334 kilometers) southwest and into the Gulf of California.
“We’re at a moment where we’re reckoning with how we continue to flourish with less water, and it’s very painful,” said Sarah Porter, director of the Kyl Center for Water Policy at Arizona State University.
