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Hike-in Required
No
Open Year-round
?
ADA accessible
Yes
Guided tours
No
Please respect the outdoors and leave no trace. One tip how to dispose of waste properly: Pack out toilet paper and hygiene products. For more information, visit https://lnt.org/learn/7-principles

Hundreds of thousands of years ago the massive Mount Tehama volcano dominated what is now the southern side of Lassen Peak in Lassen Volcanic National Park. The collapse of its large 2-mile wide caldera has since left a series of smaller landforms as well as the Sulphur Works, the volcanic center of what used to be Mount Tehama that is still very active to this day.

The Lassen Volcanic scenic drive (CA-89) actually goes over part of the Sulphur Works and has paved sidewalks on both sides that eventually lead to a paved parking area with a restroom off the road. On the south side of the road is a steam vent, and on the north side is a boiling mud pit as well as a view up the hill where the terrain is colored with bright whites, yellows, and oranges due to the sulfuric gases and acids breaking down the terrain. All in all, the Sulphur Works are a much smaller and more accessible version of the larger and more popular Bumpass Hell geothermal area, the trailhead of which is just a few miles up the road for those entering from the south.

Logistics + Planning

Preferable season(s)

Summer
Fall

Congestion

Moderate

Parking Pass

National Park Pass

Pros

Close views of geothermal areas. ADA-accessible. Plentiful parking.

Cons

Foul-smelling volcanic fumes. No vehicular access in winter.

Pets allowed

No

Address

CA-89
CA 96061
United States

Features

Geologically significant
ADA accessible

Location

Field Guide + Map

Nearby Adventures

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