Lion Geyser (2025) @jsj1771

Uploaded September 2025 | Updated September 2026, 2 weeks ago

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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.

Lion Geyser is a cone-type geyser in the Geyser Hill Group in Yellowstone's Upper Geyser Basin. It erupts in series, with many hours between a series end and the next series start. The first eruption in a series has a longer duration - about 7 minutes. Subsequent eruptions are about 3 to 4 minutes long. About one hour separates individual Lion eruptions. After an initial eruption, the next is about 1 hour, 20 minutes later. Occasionally, Lion has minor eruptions of well less than a minute duration and usually with a shorter column height. Normal Lion eruptions reach about 50 feet high. Some Lion series consists of 1 eruption only. An extremely long series consisting of 30 eruptions has been recorded.

Geyser Hill Group videos:
youtube.com/playlist?list=PL8dL6UmmXTBUMW6oQAafxBFkkAvXyDrE3

Filmed from a bench at Sponge Geyser.

Clips 1-2 - Lion Geyser’s 1:22 to 1:28 PM eruption (= initial eruption of a two-eruption series) on 10 August 2025.

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UNNG-FLD-18 (unnamed geyser north of West Flood Geyser)

$Cinnamon West Geyser & Cinnamon Spouter (2025) Cinnamon West Geyser & Cinnamon Spouter (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. Cinnamon Spouter and Cinnamon West Geyser are located in the Black Sand Basin of Yellowstone’s Upper Geyser Basin. Cinnamon Spouter’s irregularly-shaped basin is 3 to 4 meters in diameter, with a centrally-located and irregularly-shaped vent area. Cinnamon West Geyser is located on the southwestern side of Cinnamon Spouter and has a subcircular basin 2 to 3 meters in diameter, with a ~1 meter diameter inner crater. Cinnamon Spouter first appeared in the late 1980s, under a tourist boardwalk. Early activity consisted of periodic geyser eruptions. The long-term, normal behavior of Cinnamon Spouter has become moderately low perpetual spouting that reaches about two meters high or less (usually much lower). After individual periodic eruptions occur in adjacent Cinnamon West Geyser (for example, in 2016), Cinnamon Spouter’s water level lowers and runoff ceases. Low-pool perpetual spouting can continue or activity can cease altogether, with water draining out of sight. Runoff water from Cinnamon Spouter drains to the south and southeast toward Iron Spring Creek. In August 2025, the distal runoff channel was completely dry - overflow was no longer occurring. In 1998, researchers measured the water temperature of Cinnamon Spouter at about 75° Celsius, with a pH of about 8.3 (= somewhat alkaline). Cinnamon West Geyser appeared subsequent to Cinnamon Spouters first appearance in the late 1980s. Cinnamon West Geyser was initially a fracture but has since widened into its present shape. Its normal behavior is low to very low perpetual spouting. It also has 1 to 2 meter tall geyser eruptions that occur in series, with hours- to days-long intervals between series. The first two eruptions in a series pour out large volumes of water for such a small feature. Water runs off toward the south and southwest and percolates downward into the geyserite / siliceous sinter gravel. Black Sand Basin videos: https://www.youtube.com/playlist?list=PL8dL6UmmXTBVwmCwqDQXjddb1pn82Whbf All clips - Cinnamon West Geyser & Cinnamon Spouter erupting in the late afternoon of 5 August 2025.$