By late July 2026 Elephant Butte, New Mexico’s largest reservoir, held just 1.4 percent of capacity. Years of extreme drought combined with an unprecedented early snowmelt in the southern Rockies exposed shoreline debris and tightened water for farms along the Rio Grande.
Elephant Butte Reservoir dropped to 1.4% capacity on July 27, 2026, its lowest level since 1971.
An unusually early snowmelt in 2026 plus prolonged drought reduced inflows and stressed Rio Grande water supplies used by New Mexico and Texas farms.
NASA-supported satellite and modeling projects are providing near-real-time data and combined measurements (satellite, drone, ground) to help water managers allocate scarce water.
Elephant Butte Reservoir, the largest reservoir in New Mexico, was recorded at just 1.4 percent of capacity on July 27, 2026. The low point followed years of extreme drought in the Rio Grande basin and a record-early snowmelt in the river's headwaters in the southern Rocky Mountains during 2026.
The reservoir held substantially more water in past decades: it was nearly full on June 2, 1994, and it reached an annual low of 2.9 percent during a prior drought on July 8, 2013. The 2026 decline left long-submerged debris visible along the shoreline and sediment covered boat ramps at Elephant Butte Lake State Park.
Shortened mountain snowpack and early melt in 2026 reduced the seasonal inflow that normally replenishes the Rio Grande and downstream storage. That pattern compounded multi-year dryness across the basin, producing the severe depletion at Elephant Butte.
State officials stopped agricultural water releases after July 28, 2026, giving the reservoir a chance to begin rising. The pause reflects immediate operational choices to preserve remaining storage once inflows fell short of demand.
NASA-supported monitoring and tools
Several efforts tied to NASA's Western Water Action Office provide additional data for managers:
The low reservoir level illustrates a narrowing margin for allocating water among agricultural, municipal, and ecological needs in the Rio Grande valley. Managers now rely more on combined remote sensing and on-the-ground observations to make allocation decisions as the region confronts limited storage and variable inflows.
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The scientists managing NASA’s imaging satellites are not only tracking the reservoir’s disappearing water but also assisting drought-ravaged farmers and local communities.
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