150°F7,884 ftOpenShort WalkNational Park ServiceCamping nearby (5.1 mi)
Very Hot Source — Use Extreme Caution
At 150°F, the source water at Mill Creek Springs is hot enough to cause burns. Some hot springs this hot have cooler side pools or downstream areas suitable for soaking — always test the water temperature before entering.
File:Aconogonon davisiae kz01.jpg — cc by-sa 4.0
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.
History of Mill Creek Springs
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.
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.
Is Mill Creek Springs worth visiting?
Best for
Observing powerful hot springs
Overnight camping trips
Not ideal for
Casual soaking
Mill Creek Springs is well suited for observing powerful hot springs and overnight camping trips.
Monthly Climate
26°Jan
25°Feb
28°Mar
33°Apr
41°May
53°Jun
61°Jul
60°Aug
53°Sep
43°Oct
32°Nov
25°Dec
Annual Precip: 45.7 inAnnual Snow: 208.9 in
Best Time to Visit
DecemberAir 25°F · Water 150°F · +126° contrast
FebruaryAir 25°F · Water 150°F · +125° contrast
JanuaryAir 26°F · Water 150°F · +124° contrast
December offers 37°F more contrast than July
USGS Field Measurements
Recent Temperature
39.2°F
(4.0°C)Measured Jun 30, 1981
Water ChemistrySampled 1981-06-30
The water at Mill Creek Springs is slightly acidic (pH 6.1) with 88 mg/L total dissolved solids.
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...
What is the water temperature at Mill Creek Springs?
Mill Creek Springs has a water temperature of 150°F (66°C). This is considered a hot spring, well above body temperature.
Where is Mill Creek Springs located?
Mill Creek Springs is located in Shasta County, California at 7,884 feet elevation, near Shingletown. Coordinates: 40.4570°N, 121.5450°W.
How do I get to Mill Creek Springs?
Mill Creek Springs has Short Walk road access (0.7 mi from the road).
Is Mill Creek Springs free to visit?
Mill Creek Springs has Open access. It is managed by National Park Service.
Can I camp near Mill Creek Springs?
Yes, Manzanita Lake Group Campground is located nearby (5.1 miles away).
What minerals are in the water at Mill Creek Springs?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 6.1 (slightly acidic). Total dissolved solids measure 88 mg/L.
Is it safe to soak at Mill Creek Springs?
The water at Mill Creek Springs reaches 150°F, which can cause severe burns. Do not enter the source pool directly — look for cooled side pools or downstream areas where the water has cooled to a safe temperature. Always tell someone your plans before visiting remote hot springs.
Is Mill Creek Springs crowded?
Mill Creek Springs sees varying levels of visitors depending on the season and day of the week.
What should I bring to Mill Creek Springs?
Essentials for Mill Creek Springs: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in. The water is over 110°F — test the temperature before entering and watch for scalding near the source.
