Uploaded May 2026 | Updated September 2026, 2 weeks ago
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Surprise Pool
Hot springs are sites where groundwater emerges at the Earth’s surface (or on the seafloor). Hot spring water has to be higher in temperature than the human body (an arbitrary definition): over 98° Fahrenheit or over 37° Celsius. Geysers are hot springs that episodically erupt columns of water. The highest concentration of geysers and hot springs anywhere is at Yellowstone in northwestern Wyoming, USA.
Surprise Pool is a non-erupting hot spring in the Great Fountain Group of Yellowstone’s Lower Geyser Basin. It is located southwest of Great Fountain Geyser along Firehole Lake Drive. Its crater is irregularly-shaped, ~3 meters wide, and almost 5 meters in length. Boiling occurs along much of the crater’s border. A runoff channel is present on the western side of the spring. Runoff drains westward, then ~southward, and then ~westward into many small distributaries. Distal runoff water percolates downward into siliceous sinter gravel and some runoff drains into nearby White Creek
In 1998, researchers measured the temperature of Surprise Pool at about 94 degrees Celsius, with a pH of about 8.3 (slightly alkaline).
All clips - Surprise Pool in the late morning of 11 August 2013.
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Surprise Pool
Hot springs are sites where groundwater emerges at the Earth’s surface (or on the seafloor). Hot spring water has to be higher in temperature than the human body (an arbitrary definition): over 98° Fahrenheit or over 37° Celsius. Geysers are hot springs that episodically erupt columns of water. The highest concentration of geysers and hot springs anywhere is at Yellowstone in northwestern Wyoming, USA.
Surprise Pool is a non-erupting hot spring in the Great Fountain Group of Yellowstone’s Lower Geyser Basin. It is located southwest of Great Fountain Geyser along Firehole Lake Drive. Its crater is irregularly-shaped, ~3 meters wide, and almost 5 meters in length. Boiling occurs along much of the crater’s border. A runoff channel is present on the western side of the spring. Runoff drains westward, then ~southward, and then ~westward into many small distributaries. Distal runoff water percolates downward into siliceous sinter gravel and some runoff drains into nearby White Creek
In 1998, researchers measured the temperature of Surprise Pool at about 94 degrees Celsius, with a pH of about 8.3 (slightly alkaline).
All clips - Surprise Pool in the late morning of 11 August 2013.
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