Fan and Mortar Geysers, Geothermal formations in Upper Geyser Basin, Yellowstone National Park, United States.
Fan and Mortar Geysers release streams of hot water and steam through multiple vents near the Firehole River at temperatures reaching 118.8 degrees Fahrenheit.
The Washburn-Langford-Doane Expedition named Fan Geyser in 1870, while photographer Frank Jay Haynes designated Mortar Geyser in 1883 based on its discharge pattern.
These geysers represent the geological forces that led Congress to establish Yellowstone as the first National Park in 1872 to protect natural phenomena.
Visitors can observe both geysers from a bridge and sidewalk leading to Morning Glory Pool, with unpredictable eruption intervals ranging from days to months.
The geysers became interconnected below ground prior to 1925, resulting in synchronized eruptions where Fan reaches 100 feet while Mortar extends 50 feet high.
Location: Wyoming
GPS coordinates: 44.47440,-110.84200
Latest update: March 4, 2025 00:51
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Daisy Geyser
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Bulger Geyser
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Bijou Geyser
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Comet Geyser
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Baby Daisy Geyser
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Penta Geyser
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Economic Geyser
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Biscuit Basin Geyser
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Fan Geyser
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Mortar Geyser
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Oblong Geyser
582 m
Biscuit Basin
1.4 kmReviews
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