Mark Garcia can see that theres no shortage of water in the Rio Grande this year. The river flows past his farm in central New Mexico, about 50 miles south of Albuquerque. The rush of springtime water is a welcome change after years of drought, but he knows the good times wont last. As the summer continues, the river will diminish, leaving Garcia with a strict ration. Hell be allowed irrigation water for his 300 acres just once every 30 days, which is nowhere near enough to sustain his crop of oats and alfalfa.

For decades, Garcia and other farmers on the Rio Grande have relied on water released from a dam called El Vado, which collects billions of gallons of river water to store and eventually release to help farmers during times when the river runs dry. More significantly for most New Mexico residents, the dam system also allows the city of Albuquerque to import river water from long distances for household use. But El Vado has been out of commission for the past three summers, its structure bulging and disfigured after decades in operation and the government doesnt have a plan to fix it.

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Surface water imports from the El Vado system have generally allowed public officials in Albuquerque to limit groundwater shortages. This echoes the strategies of other large Western cities such as Phoenix and Los Angeles, which have enabled population growth by tapping diverse sources of water for metropolitan regions and the farms that sit outside of them. The Biden administration is seeking to replicate this strategy in water-stressed rural areas across the region, doling out more than $8 billion in grants to support pipelines and reservoirs. But the last decade has shown that this strategy isnt foolproof at least not while climate change fuels an ongoing megadrought across the West. Los Angeles has lost water from both the Colorado River and from a series of reservoirs in Northern California, and Phoenix has seen declines not only from the Colorado but also from the groundwater aquifers that fuel the states cotton and alfalfa farming. Now, as Albuquerques decrepit El Vado dam goes out of commission, the city is trying to balance multiple fragile resources.

El Vado is an odd dam: Its one of only four in the United States that uses a steel faceplate to hold back water, rather than a mass of rock or concrete. The dam has been collecting irrigation water for Rio Grande farmers for close to a century, but decades of studies have shown that water is seeping through the faceplate and undermining the dams foundations. When engineers tried to use grout to fill in the cracks behind the faceplate, they accidentally caused the faceplate to bulge out of shape, threatening the stability of the entire structure. The Bureau of Reclamation, the federal agency that manages the dam, paused construction and is now back at the drawing board.

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