Fumaroles
Fumaroles vent superheated steam high in the Sierra at 8,167 feet, where the geothermal system expresses itself through mountain air in protected National Forest terrain.
The journey requires a short 1,500-foot walk through alpine landscape where wind, rocky terrain, and dramatic elevation define the experience. These steam vents emerge in a harsh environment dominated by sparse vegetation and volcanic rock, creating an otherworldly thermal display in the midst of pristine backcountry near Mammoth Lakes.
Access via Lake Mary Campground area with a short uphill hike; check Forest Service conditions before visiting as snow blocks access most of the year. Best season is July through September. Bring warm layers even in summer at this elevation.
The fumaroles represent high-elevation geothermal expression within Inyo National Forest, where the same volcanic systems that powered lower-elevation springs manifest as pure steam vents at altitude. The landscape's extreme winter conditions—nearly 200 inches of annual snow—mean these features are most accessible during summer months.
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Overview Lake Mary is the star of the Mammoth Lakes region. Of the 11 lakes in the area, Mary is the largest and most developed. Lake Mary Campground is a large facility with plenty of amenities in and around it. The lake provides a great base for activities like fishing, viewing waterfalls, hiking and backpacking.Recreation Lake Mary receives the highest number of trout stocks in the Mammoth Lakes Basin, and is well-known to anglers for its rainbow, brook and brown trout fishing. No swimmin...
At 8,167 feet, Fumaroles is in high-altitude territory where the air is noticeably thinner. Soaking in hot water accelerates dehydration and can amplify altitude effects like headache and fatigue. UV radiation is roughly 33% stronger here — wear sunscreen even on overcast days and take breaks from the water to rehydrate.
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Fumaroles is road-accessible, so you can bring more gear. Cold air temperatures make a changing robe or warm layers essential.
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