Yellowstone National Park in Park County, Wyoming — The American West (Mountains)
Changing with the Seasons
All hydrothermal features change, but Grizzly Fumarole changes from day to day, and season to season, reflecting recent weather conditions.
What is Hydrothermal?
Hydro = Water Thermal = Heat
During dry weather, steam rises from Grizzly Fumarole’s mostly dry vents
Rain or snow transforms the fumarole into mudpots. A single, large mudpot often appears in Spring.
Mudpot or Fumarole?
A fumarole or steam vent’s underground system is nearly dry. Heated deep below the surface, the water turns to steam, the rises with other gasses.
Mudpots are muddy springs. Microorganisms live in mudpots and convert hydrogen sulfide gas from Yellowstone’s magma chamber into sulfuric acid. This acid breaks rock and soil into mud.
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Yellowstone’s Hydrothermal Features
Underground water is heated by Yellowstone’s magma chamber. Extreme water pressure forces the super-heated water to rise.
Erected by National Park Service.
Location. 44° 37.391′ Click for map. Marker is on a walking trail in the Mud Volcano area. Marker is in this post office area: Yellowstone National Park WY 82190, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Cooking Hillside (about 700 feet away, measured in a direct line); Dragon's Mouth Spring (about 700 feet away); Mud Volcano (about 700 feet away); Mud Geyser (about 700 feet away); Churning Caldron (approx. 0.2 miles away); Black Dragon’s Caldron (approx. 0.2 miles away); Volcanic Landscape (approx. 0.3 miles away); Sulphur Caldron (approx. 0.3 miles away). Click for a list of all markers in Yellowstone National Park.
More about this marker. Photographs of Grizzly Fumarole during a dry spell and as a bubbling mudpot appear at the bottom left of the marker. The sidebar includes a diagram of thermal features like Mudpots, Hot Springs, Cone Geyser, Fountain Geyser, and Fumarole.
Categories. • Natural Features •
Credits. This page originally submitted on , by Bill Coughlin of North Arlington, New Jersey. This page has been viewed 125 times since then and 5 times this year. Photos: 1, 2, 3, 4. submitted on , by Bill Coughlin of North Arlington, New Jersey. This page was last revised on June 16, 2016.