description Mud Caldron Overview
Mud Caldron is a large, active mudpot located in the Mud Volcano thermal area of Yellowstone National Park in Wyoming. It consists of a highly acidic hot spring where microorganisms consume sulfur and produce hydrogen sulfide gas, resulting in a muddy, bubbling consistency. The feature has been historically described as being roughly 40 by 60 feet across, though its size and activity can fluctuate with geothermal changes. Visitors to the park's lower loop can observe the Caldron from designated boardwalks.
help Mud Caldron FAQ
Where is Mud Caldron located?
Mud Caldron is in the Mud Volcano thermal area of Yellowstone National Park in Wyoming. It is part of Yellowstone's active geothermal landscape.
Why does Mud Caldron bubble like mud?
Microorganisms consume sulfur in the acidic thermal environment and produce hydrogen sulfide gas. The gas rises through the hot, mineral-rich water and creates the bubbling mud-like appearance.
Is Mud Caldron a hot spring or a mudpot?
Mud Caldron is classified as a mudpot. Unlike a clear hot spring, it contains thick, acidic mud produced by geothermal fluids reacting with surrounding rock.
Is Mud Caldron safe to touch?
No. Yellowstone geothermal features can be extremely hot and acidic, and hydrogen sulfide is hazardous. Visitors should remain on designated paths and never enter or touch the mudpot.
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