Arizona Reservoir Nearly Dries Up After Snowpack Collapse, Triggering Fish Kill
Arizona Reservoir Nearly Dries Up After Snowpack Collapse, Triggering Fish Kill
US · Published Jun 19, 2026
The San Carlos Reservoir in Arizona, a critical water source created by the Coolidge Dam, has nearly dried up following an unprecedented collapse of snowpack in the Gila River watershed. According to ScienceDaily, snowfall in the region was exceptionally low in 2026, with snowpack levels at just 2% of the 1991-2020 March median. This led to drastically reduced streamflow, which reached only 39% of normal levels in April. By June, the reservoir held less than 400 acre-feet of water, making it less than 1% full. Satellite imagery from May 2026 starkly contrasts the reservoir's current state with its 60% capacity in June
The low water levels caused oxygen depletion, resulting in a massive fish kill and the indefinite closure of the reservoir on June 5,

Why It's Important?

The near-total depletion of the San Carlos Reservoir has significant ecological, economic, and public health implications. The hypoxic conditions have killed nearly all fish in the reservoir, disrupting local ecosystems and recreational fishing activities. The San Carlos Recreation and Wildlife Department has warned of potential health risks from decomposing fish, which could affect those attempting to fish or boat in the area. Historically, the reservoir has experienced similar low-water events, but the current situation underscores the increasing vulnerability of water resources in the Southwest due to prolonged drought and climate variability.

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