As northern Mexico faces a historic drought, tensions over a decades-old water-sharing agreement between the United States and Mexico are intensifying. In San Francisco de Conchos, Chihuahua, local farmers and residents are witnessing the drastic drop in water levels at Lake Toronto—a key reservoir behind the state’s La Boquilla Dam—where water supplies have fallen dramatically after 30 consecutive months without rain.
Rafael Betance, who has monitored La Boquilla’s water levels for 35 years, reports the reservoir now holds less than 14% of its capacity, with water levels 26.5 meters below the high-water mark. He recalls the last overflow occurred in 2017, with a steady decline each year since. Residents gather on the lake’s dry, rocky bed hoping for rain, but the region’s relentless 42°C (107.6°F) heat continues to worsen the drought.
Longstanding Water Sharing Treaty Under Strain
At the heart of this dispute lies the 1944 treaty governing water allocation from the Rio Grande (known as the Río Bravo in Mexico) between the two countries. Mexico is obligated to deliver 430 million cubic meters of water annually to the US, managed through tributary channels and shared reservoirs under the International Boundary and Water Commission (IBWC). In exchange, the US supplies nearly 1.85 billion cubic meters of Colorado River water to Mexican border cities like Tijuana and Mexicali.
However, Mexico has frequently fallen behind on its water deliveries during the 21st century, spurring frustrations across the border. Republican lawmakers in Texas pressed the Trump administration to take a tougher stance, culminating in public accusations by former President Donald Trump on his social media platform in April 2023. Trump alleged Mexico was “stealing” water and threatened tariffs or sanctions to enforce compliance, though no specific deadlines were outlined.
Mexican President Claudia Sheinbaum has acknowledged the shortfall caused by drought but has adopted a more conciliatory tone. Recently, Mexico transferred approximately 75 million cubic meters of water to the US through the Amistad Dam, but this represents only a small portion of the roughly 1.5 billion cubic meters owed.
The issue carries a heavy emotional and social toll. In 2020, clashes at La Boquilla Dam resulted in fatalities when Mexican farmers attempted to prevent water diversion. Locals argue that during extreme drought, it’s impossible to deliver water that simply isn’t available.
Meanwhile, Texas farmers like Brian Jones, a fourth-generation grower in the Rio Grande Valley, struggle with insufficient irrigation. Jones claims Mexican officials withheld water in 2022, accusing them of using it domestically to sustain crops that compete with US farmers. “We’re just asking for what the treaty guarantees,” Jones says.
Mexican farmers contest this interpretation, emphasizing their right to prioritize local agricultural needs amid unprecedented water scarcity. The Rio Conchos Valley in Chihuahua relies heavily on water-intensive crops such as walnuts and alfalfa. Traditional irrigation involves flooding fields with open-channel water, a practice criticized by US counterparts for inefficiency.
However, some Mexican farmers like Jaime Ramirez are adopting modern sprinkler systems, cutting water use by an estimated 60%. Ramirez, a former mayor of San Francisco de Conchos, encourages sustainable irrigation but acknowledges that many farmers cannot afford the upfront costs. He stresses the dire stakes: without significant rain, agriculture in the region risks collapse, making conservation for drinking water a necessity.
Many in northern Mexico believe the 1944 treaty no longer reflects current reality. Climatic shifts, population growth, and economic changes demand an updated approach to jointly managing this vital resource. Conversely, some US farmers maintain that the agreement remains the best framework and should be upheld strictly.
Beyond agriculture, the drought is threatening aquatic ecosystems and local livelihoods. Rising water temperatures in Lake Toronto endanger fish populations crucial to a once-thriving tourism sector. Betance notes this is the worst water crisis he has recorded in his decades of monitoring, underscoring the critical need for coordinated transboundary water solutions.
As the US and Mexico navigate this deepening water crisis, the question remains: how will both nations adapt longstanding agreements to the pressures of climate change and growing water scarcity?
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