Opal Pool, Hot spring in Midway Geyser Basin, Yellowstone National Park, Wyoming, US.
The Opal Pool maintains an average temperature of 132°F and functions as both a hot spring and fountain-type geyser in Yellowstone National Park.
The first recorded eruption of Opal Pool occurred in 1947, followed by sporadic activity until 1953, then resumed regular eruptions from 1979 onwards.
Native American tribes of Wyoming recognized the medicinal and spiritual importance of the thermal waters found throughout the Yellowstone region.
Visitors can reach Opal Pool through established boardwalks in the Midway Geyser Basin, following National Park Service safety guidelines for thermal area exploration.
The pool experienced a complete drainage in 2005 and refilled by 2008, transforming into a green-colored water feature that erupts up to 80 feet high.
Location: Wyoming
GPS coordinates: 44.52670,-110.83900
Latest update: March 5, 2025 22:40
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