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A staggering 1.1 billion tons of ice has just been discovered hiding in Utah’s mountains While traditional glaciers across the globe are rapidly shrinking due to rising temperatures, Utah’s 836 documented rock glaciers are quietly preserving immense reserves of frozen water. These unique formations look like ordinary, rocky mountain slopes on the surface, but underneath, a dense mix of ice and rock slowly creeps downhill — with many ice formations stretching more than 120 feet deep. Because their thick blanket of rocky debris scatters conventional radar signals, scientists from the University of Utah used highly sensitive gravity measurements to peer inside the Timpanogos Rock Glacier. By measuring the minute gravitational differences caused by low-density ice compared to the heavy surrounding bedrock, researchers reconstructed the glacier’s interior in 3D, revealing that its core is up to 83% pure ice. By extrapolating these localized findings across the state, scientists estimate that Utah’s rock glaciers hold roughly 1.1 billion U.S. tons of hidden ice. This natural armor of rock and sediment insulates the underlying ice from surface heat, allowing these landforms to act as reliable, long-term water towers. As global temperatures continue to rise, understanding and protecting these subterranean reservoirs becomes increasingly critical. Overlooking these hidden glaciers risks miscalculating mountain water budgets, which could threaten downstream ecosystems, local agriculture, and public drinking water systems that millions rely on. source: Cvijanovich, B., Thorne, M. S., Pachhai, S., Anderson, L. S., Tochimani-Hernandez, I., Hardwick, C. L., & van Dam, T. (2026). The Internal Ice Content of Timpanogos Rock Glacier, Utah, USA From 3-D Bayesian Inversion of Gravity Data. Journal of Geophysical Research: Earth Surface, 131(8).