Mud Volcano


Early explorers to Yellowstone described this feature as a "most repulsive and terrifying sight," a volcano-like cone, 30 feet high and 30 feet wide (9 m by 9 m) with mud erupting to cover tall trees. When Nathaniel P. Langford visited it in 1872, however, he saw "a seething, bubbling mass of mud." It's likely that a violent eruption blew out the side of the cone, leaving the crater seen today. Rich in iron sulfides and powered by heavy gas discharge, the gray-colored water constantly undercuts the back wall.

*Adapted from the NPS Mud Volcano Trail Guide

Feature Type

Not Reported

Inventory ID



Latitude: 44.62432
Longitude: -110.4345
Survey Date: July 21, 1998

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

Feature Data

Data Source Supplied By Sample Date Temp Vent Temp pH Cond Extended Data
Park 7/21/1998 86°C 0°C 3 2070 µS/cm No
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