description Big Boiler Overview
Big Boiler is a large fumarole in Bumpass Hell, the hydrothermal area of Lassen Volcanic National Park in northern California. It releases steam and volcanic gases from the park's active geothermal system, and measurements at the feature have reached about 322 degrees F (161 degrees C). The site illustrates the high-temperature hydrothermal activity created by heat from the Lassen volcanic center.
help Big Boiler FAQ
Where is Big Boiler located?
Big Boiler is a large fumarole in Bumpass Hell, the hydrothermal area of Lassen Volcanic National Park in northern California. It is one of the prominent steam and gas features in that geothermal basin.
How hot is Big Boiler?
Measurements at Big Boiler have reached about 322 degrees Fahrenheit, or 161 degrees Celsius. That extreme heat is why visitors must remain on the designated trail and boardwalk.
What comes out of the Big Boiler fumarole?
It releases steam and volcanic gases from Lassen’s active geothermal system. Fumaroles are vents where heated underground fluids and gases escape without necessarily producing a lava eruption.
Is Big Boiler safe to approach closely?
The area is hazardous because the ground can be thin, unstable, and extremely hot, and the gases can be harmful. Visitors should stay on marked routes in Bumpass Hell and obey current National Park Service closures.
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