Mud Geyser


Mud Geyser was the star attraction of the Mud Volcano Area when first seen by members of the Washburn Expedition of 1870. They described it as "a boiling spring, a placid pond, a deep dry funnel or an active geyser according to the time of one's visit." At that time, muddy water would explode 50 feet (17 m) into the air every few hours. The geyser died in the 20th century, its plumbing clogged with mud and gravel. In 1993, soil temperatures skyrocketed for unknown reasons and trees began dying around the geyser's south rim. By January 1995, a new feature on the south bank of Mud Geyser had burst onto the scene. Steam vents and shallow pools sizzled. In 1999, mudpots formed and then exploded, leaving a deep hole with more sizzling features and mud.

*Adapted from the NPS Mud Volcano Trail Guide

Feature Type


Inventory ID



Latitude: 44.6231
Longitude: -110.4323
Survey Date: July 24, 1998

Geographic Area: Hayden Valley
Ranger District Contact: Norris District, Al Miller (307) 344-2501


Nordstrom, D. Kirk
Takacs-Vesbach, Cristina

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
Park 7/24/1998 43.5°C 0°C 2.5 4800 µS/cm No
Participant Takacs-Vesbach, Cristina 6/5/2003 34.8°C -- 1.89 5350 µS/cm Yes Details
USGS 6/5/2003 34.7°C -- 1.93 5350 µS/cm Yes Details
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