Gas Vent
Gas Vent emerges at 7,520 feet elevation within Yellowstone's Norris Geyser Basin roadside area, flowing at approximately 57 degrees Fahrenheit based on recent USGS measurements of 13.7 degrees Celsius, with moderately acidic chemistry at pH 4.7.
The thermal feature sits just 252 feet from the Grand Loop Road in Gallatin County, accessible via boardwalks through the Norris basin complex. The spring exhibits low mineral content with only 3.81 milligrams per liter of calcium and minimal dissolved solids, indicating rapid circulation through volcanic rock with limited water-rock interaction time. The surrounding landscape features scattered thermal vents and fumaroles amid barren ground stained by sulfur and iron deposits. At 7,520 feet elevation with 34-degree average temperatures and 137 inches of annual snow, the area experiences harsh winters with dramatic temperature contrasts between thermal features and ambient air.
The descriptive name reflects gas emissions accompanying the thermal discharge, characteristic of Norris's high-heat volcanic environment. This basin has been recognized as Yellowstone's most volatile thermal area since early scientific surveys in the 1870s. The National Park Service maintains monitoring equipment throughout Norris to track temperature, chemistry, and seismic changes that can signal shifting volcanic processes beneath the surface.
Visit via the Norris Geyser Basin trail system from the Grand Loop Road, accessible May through October. The roadside location requires only a short walk on paved boardwalks suitable for most mobility levels. Gas emissions can be strong when winds are calm; proceed cautiously if you smell hydrogen sulfide. Early morning visits provide better lighting and fewer crowds. Indian Creek Campground at 15.3 kilometers offers the nearest camping with advance reservations required.
Is Gas Vent worth visiting?
Best for
- Easy day trips
- Overnight camping trips
The water at Gas Vent is acidic (pH 4.7).
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...