Blank Spring, also known as Manzanita Mine Springs, produces 112-degree water from volcanic Lake County terrain at 1,721 feet elevation on Bureau of Land Management land.
The spring sits 46 feet from a road in the volcanic landscape near Clearlake. The area receives nearly 22 inches of annual precipitation and only about 5 inches of snow, creating a relatively mild climate. USGS data records the water as slightly acidic at pH 6.7, indicating mineral-rich discharge typical of thermal springs in this geologically active region.
History of Blank Spring, Manzanita Mine Sprs
The spring's alternate name references historical mining activity in the area, where mineral-rich geothermal water may have attracted interest in past decades. The Bureau of Land Management designation indicates public lands where geothermal features remain available for scientific and recreational use under federal management guidelines.
Roadside access from marked roads provides straightforward visitation to this BLM spring. The acidic water (pH 6.7) makes this spring less suitable for bathing than some others. Little Stony Campground, 30.9 kilometers away, offers first-come, first-served access for those planning extended visits. Visit year-round in this mild climate region.
Is Blank Spring, Manzanita Mine Sprs worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
Blank Spring, Manzanita Mine Sprs offers an accessible hot spring experience — great for a day trip.
Annual Precip: 21.9 in
Annual Snow: 4.8 in
January
Air 47°F · Water 112°F · +65° contrast
December
Air 47°F · Water 112°F · +65° contrast
February
Air 49°F · Water 112°F · +63° contrast
January offers 34°F more contrast than July
Recent Temperature
80.6°F
(27.0°C)
Measured Nov 16, 2015
The water at Blank Spring, Manzanita Mine Sprs is slightly acidic (pH 6.7).
pH influences mineral absorption through skin
Overview
This location is available on a first-come, first-served basis only. Visitors are required to physically arrive at the campground to purchase and claim a site.Once on-site, you are able to pay for your campsite(s) by scanning a QR code using the Recreation.gov mobile app, and the Scan and Pay feature.In order to utilize Scan & Pay on site, you will need to first download the free Recreation.gov mobile app https://www.recreation.gov/mobile-app prior to your arrival as some remote area...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Little Stony
Trash bag
Pack out what you pack in
Water shoes
Hot ground near source
1 miles from Clearlake, CA
USGS Quad: WILBUR SPRINGS 15 · PP 492: 66.0 · Circ 790: 44.0 · NOAA: 13.0 · AMS Map: UKIAH
What is the water temperature at Blank Spring, Manzanita Mine Sprs?
Blank Spring, Manzanita Mine Sprs has a water temperature of 112°F (45°C). This is considered a hot spring, well above body temperature.
Where is Blank Spring, Manzanita Mine Sprs located?
Blank Spring, Manzanita Mine Sprs is located in Lake County, California at 1,721 feet elevation, near Clearlake. Coordinates: 39.0320°N, 122.4320°W.
How do I get to Blank Spring, Manzanita Mine Sprs?
Blank Spring, Manzanita Mine Sprs has Roadside road access (152 ft from the road).
Is Blank Spring, Manzanita Mine Sprs free to visit?
Blank Spring, Manzanita Mine Sprs has Open access. It is managed by Bureau of Land Management.
Can I camp near Blank Spring, Manzanita Mine Sprs?
Yes, Little Stony is located nearby (19.2 miles away).
What minerals are in the water at Blank Spring, Manzanita Mine Sprs?
Water chemistry analysis shows the presence of pH. The pH is 6.7 (slightly acidic).
Is it safe to soak at Blank Spring, Manzanita Mine Sprs?
At 112°F, Blank Spring, Manzanita Mine Sprs is hot enough to require caution. Enter slowly, limit soaking sessions to 15–20 minutes, and stay hydrated. Always tell someone your plans before visiting remote hot springs.
Is Blank Spring, Manzanita Mine Sprs crowded?
Blank Spring, Manzanita Mine Sprs is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Blank Spring, Manzanita Mine Sprs?
Essentials for Blank Spring, Manzanita Mine Sprs: swimsuit, towel, water bottle, 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.