Scientists used geothermal drill-hole temperatures in Oregon’s Cascades and found at least 81 cubic kilometres of water hidden in volcanic rock, nearly 3 times Lake Mead’s capacity

Beneath the forested slopes of Oregon’s Cascade Range, scientists have uncovered a vast, hidden reservoir of water locked inside volcanic rock. By analysing temperature data from geothermal drill holes, a University of Oregon-led team estimated that at least 81 cubic kilometres of water are stored in the region’s subsurface, nearly three times the capacity of Lake Mead, the largest reservoir in the United States. The discovery, announced by the university , reshapes how researchers think about water storage in volcanic mountains and could have implications for everything from regional water budgets to volcanic hazard assessment.

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