Bumpass Hell Look only
Bumpass Hell reads 199°F at the source (NCEI, historical reading). Managed by Lassen Volcanic National Park (checked 2026-08-19).
199°F / 93°C
Boiling-class range at the source — scalds in seconds
Reading from the NCEI Thermal Springs List (historical reading, 1981 compilation). Source temperature — lower pools usually run cooler.
Water temperatures change with flow and season — test before entering, and never submerge your head in warm natural water. CDC guidance on Naegleria fowleri.
- Coordinates 40.455° N, 121.501° W · USGS National Map
- Land manager Lassen Volcanic National Park — checked 2026-08-19
The rule here
This is a thermal feature to see, not a place to get in the water. Lassen Volcanic National Park puts it this way:
“Do not touch or enter hydrothermal water. Even if it is not hot enough to burn you, prolonged exposure to sulfuric acid in the water and gases can cause damage to your skin and lungs.”
— Lassen Volcanic National Park, checked 2026-08-19
Worth knowing: A protected hydrothermal area inside Lassen Volcanic National Park; the park directs visitors to stay on trails or boardwalks because the ground may hide pools of acidic, boiling water or mud.
Nearby springs
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Sulphur Works, Tophet Hot Springs
2 miles away · California · 199°F at the source
Look only
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Mill Creek Springs
2 miles away · California · 150°F at the source
Look only
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Devils Kitchen
4 miles away · California · 203°F at the source
Look only
Identity, coordinates, and temperature quoted from the NCEI Thermal Springs List (historical reading, 1981 compilation).