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Bumpass Hell is the largest concentration of hydrothermal features in Lassen National park. Bumpass Hell was named after an early settler who severly burned a leg after falling into a boiling pool. The temperature of high-velocity steam jetting from Big Boiler, the largest fumarole in the park, has been measured as high as 322 F (161 C), making it one of the hottest fumaroles in the world.

Bumpass Hell - Lassen National Park

Distance: 1.5 miles
Elevation Gain: 100 feet on way back
Access Rating: 1
Find the large and signed trailhead just west of Lake Helen along the main park road. Hard to miss.
Access:
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California Climbing
The trail is very scenic with views and meadows along the way. Once you reach the basin, you must drop down into it to walk among the pools. The wide basin is filled with various steaming pools and unusual multi-colored soils, stained orange, brown, yellow and green by sulphur and other minerals.
Route:
Brokeoff Mountain Bumpass Hell view Mount Lassen from the trail Bumpass Hell Bumpass boardwalks Hot pools Hot pot
Bumpass Hell map
Mount Lassen from the trail
Hot pools
Hot pools
Boardwalks
Boardwalks
The first view of the basin
Views from the trail to Brokeoff Mountain
Bumpass Hell
Bumpass Hell