Uploaded February 2026 | Updated September 2026, 2 weeks ago
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Fountain Geyser (5:20 to 5:50 PM, 11 August 2025)
Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in northwestern Wyoming, USA.
Fountain Geyser is a large, regularly-erupting feature in the Fountain Group of Yellowstone’s Lower Geyser Basin. It has a moderately large, irregularly polygonal crater about 6 to 12 meters across. The crater is surrounded by a geyserite platform with moderately developed concentric ridges at its eastern edge. Eruption starts are preceded by a relatively rapid rise in water level. Eruptions usually last for about 30 minutes and often occur every ~4 to 6.5 hours, although intervals can be a bit shorter or much longer. Some eruptive bursts reach up to ~100 feet high. Much of the erupted water moves northward into Morning Geyser’s basin, which overflows and then drains to the north into a large field of weathered geyserite gravel. Bursting patterns show that Fountain Geyser erupts from two major subaqueous vents.
In 1998, researchers measured Fountain Geyser’s water temperature at 83.4º Celsius (= 182º Fahrenheit), with a pH of about 8.5 (slightly alkaline).
Winds blew hot steam and water toward the boardwalk during much of this eruption - a “natural sauna”. Some folks here had wind-swept “geyser heads” by the end. This was the most enjoyable traumatic experience in a long time.
Fountain Geyser videos:
youtube.com/playlist?list=PL8dL6UmmXTBVVNE8Y_oZaBatg5JvicjIV
All clips - Fountain Geyser’s 5:20 to 5:50 PM eruption on 11 August 2025.
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Fountain Geyser (5:20 to 5:50 PM, 11 August 2025)
Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in northwestern Wyoming, USA.
Fountain Geyser is a large, regularly-erupting feature in the Fountain Group of Yellowstone’s Lower Geyser Basin. It has a moderately large, irregularly polygonal crater about 6 to 12 meters across. The crater is surrounded by a geyserite platform with moderately developed concentric ridges at its eastern edge. Eruption starts are preceded by a relatively rapid rise in water level. Eruptions usually last for about 30 minutes and often occur every ~4 to 6.5 hours, although intervals can be a bit shorter or much longer. Some eruptive bursts reach up to ~100 feet high. Much of the erupted water moves northward into Morning Geyser’s basin, which overflows and then drains to the north into a large field of weathered geyserite gravel. Bursting patterns show that Fountain Geyser erupts from two major subaqueous vents.
In 1998, researchers measured Fountain Geyser’s water temperature at 83.4º Celsius (= 182º Fahrenheit), with a pH of about 8.5 (slightly alkaline).
Winds blew hot steam and water toward the boardwalk during much of this eruption - a “natural sauna”. Some folks here had wind-swept “geyser heads” by the end. This was the most enjoyable traumatic experience in a long time.
Fountain Geyser videos:
youtube.com/playlist?list=PL8dL6UmmXTBVVNE8Y_oZaBatg5JvicjIV
All clips - Fountain Geyser’s 5:20 to 5:50 PM eruption on 11 August 2025.
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