Gas Vent
Gas Vent emerges within Yellowstone's Norris Geyser Basin with extremely acidic water at pH 3.0, among the most corrosive conditions in the park, while recent USGS measurements recorded 79 degrees Fahrenheit with high iron content at 8,860 micrograms per liter.
The thermal feature sits at 7,460 feet elevation in Gallatin County approximately 711 feet from the Grand Loop Road via maintained trails through the Norris basin. The area represents Yellowstone's hottest and most dynamic thermal region, where heat flow can shift rapidly and new vents appear unpredictably. Sparse vegetation surrounds barren thermal ground stained orange and brown from iron and sulfur deposits. The acidic chemistry supports distinct thermophilic microorganisms different from alkaline hot spring communities. Annual temperatures average 35 degrees Fahrenheit with 137 inches of snow creating dramatic winter steam plumes.
The descriptive name references significant gas discharge accompanying thermal water flow, a common characteristic in the Norris basin where volcanic heat reaches close to the surface. Scientific monitoring has documented this vent as part of Norris's changing thermal landscape. The National Park Service maintains the area under permanent natural protection while conducting ongoing geochemical monitoring to track changes in this highly active thermal system.
Access from the Norris Geyser Basin parking area via the Porcelain Basin or Back Basin trails, open May through October depending on conditions. The acidic gases can irritate respiratory systems; those with asthma should use caution. Boardwalks protect both visitors and fragile thermal features. Indian Creek Campground provides the nearest camping at 16.5 kilometers distance. Winter visits require snowcoach access with advance reservations.
Is Gas Vent worth visiting?
Best for
- Overnight camping trips
The water at Gas Vent is acidic (pH 3.0). It is notably rich in sulfate (traditionally used for skin conditions and inflammation), chloride (natural antiseptic with skin health benefits), and iron (iron-rich springs may support circulation).
Overview Located about eight miles (13 km) south of Mammoth Hot Springs on the road to Norris, Indian Creek Campground—elevation 7,300 feet (2225 m)—sits near the base of the Gallatin Mountains and offers breathtaking views of Electric Peak. The area offers easy access to fishing and hiking. The campground is away from the main road and provides a quieter, more primitive, experience than many other locations. For reservations at the campgrounds managed by Yellowstone National Park Lodges (Fi...