Sulphur Works, Tophet Hot Springs
Sulphur Works and Tophet Hot Springs emerge at a dramatic 199°F at 6,932 feet elevation within Lassen Volcanic National Park, one of California's most spectacular geothermal displays accessible directly from the main park road.
The springs produce intense geothermal activity visible from the roadside, with sulfurous steam rising from colorful mineral deposits in an alpine volcanic landscape shaped by recent geological upheaval and subject to winter snowfall exceeding 200 inches.
Roadside access from Lassen Peak Highway makes viewing accessible to all visitors. Winter closures occur due to heavy snowfall. Manzanita Lake Campground within the park sits 9.4 kilometers away and offers full facilities.
These springs lie in Lassen Volcanic National Park, which protects one of the world's most active geothermal zones. The springs' mineral chemistry and water temperatures reflect recent magmatic activity beneath the peak.
The water at Sulphur Works, Tophet Hot Springs is slightly acidic (pH 6.1) with 88 mg/L total dissolved solids.
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Overview Manzanita Lake Group Campground is located at the west end of Loop B in Manzanita Lake Campground, the largest campground in Lassen Volcanic National Park. It is within walking distance of scenic Manzanita Lake, a popular fishing and family destination, and offers impressive views of Lassen Peak, the largest volcano in the park at 10,457 feet.Recreation Manzanita Lake is popular with fly fishermen who enjoy the catch-and-release policy. Non-motorized boating is also permitted and kay...
Sulphur Works, Tophet Hot Springs sits at 6,932 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 28% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Sulphur Works, Tophet Hot Springs is road-accessible, so you can bring more gear. The water is dangerously hot — bring water shoes and test pools carefully. Cold air temperatures make a changing robe or warm layers essential.
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