Mill Creek Springs
Mill Creek Springs flows at a spectacular 150°F within Lassen Volcanic National Park, making it one of California's hottest springs. Situated at 7,884 feet elevation in the heart of the park's geothermal zone, the spring exemplifies the ongoing volcanic and hydrothermal processes that define this landscape.
The spring emerges in subalpine terrain of fir and whitebark pine amid the rugged volcanic topography that characterizes Lassen's interior. The short walk from the road passes through pristine meadows and coniferous forest before reaching the thermal feature, where superheated water emerges amid colorful geothermal deposits. The setting is dramatic—you stand above 10,000 feet with views across the volcanic plateau.
This feature lies within Lassen Volcanic National Park; normal park entry fees and regulations apply. Access is via a short walk (approximately 0.75 miles) on maintained park trails. Visit July through September when snow clears the access road and high-country trails are navigable. Extreme caution required—the superheated water presents serious burn risk; stay on designated trails and observe all posted warnings.
Mill Creek sits within one of North America's most geologically active regions. The 150-degree water and chemical composition (low dissolved solids but elevated sulfate) reflect direct circulation through young volcanic rocks heated by magma at depth. The spring's presence within the park boundary ensures its protection and scientific monitoring by National Park Service geologists.
The water at Mill Creek 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...
Mill Creek Springs sits at 7,884 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 32% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
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Mill Creek 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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Slightly Acidic Springs (pH ~6.1)
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