At 144°F, the source water at Bartlett 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.
Bartlett Springs produces water at an impressive 144 degrees Fahrenheit in Lake County's rugged Coast Ranges, delivering some of the region's hottest thermal discharge.
The spring requires a short walk of about 350 feet from the nearest road through chaparral and mixed woodland. The landscape receives 31.5 inches of annual precipitation, creating seasonal variation in flow and surrounded by the native vegetation typical of California's mid-elevation terrain.
History of Bartlett Springs
These springs arise from the geologically active Coast Ranges, where tectonic activity drives thermal features. The 85-degree temperature differential above ambient air represents the geothermal gradient in this region, where deeper rock temperatures support sustained high-temperature water discharge.
The short walk keeps this spring accessible to visitors with moderate mobility. Best visited in cooler months when the extreme temperature contrasts most with the air. First-come, first-served camping at nearby Letts Lake offers flexible access.
Is Bartlett Springs worth visiting?
Best for
Observing powerful hot springs
Overnight camping trips
Not ideal for
Casual soaking
Bartlett Springs is well suited for observing powerful hot springs and overnight camping trips.
Monthly Climate
45°Jan
46°Feb
48°Mar
54°Apr
61°May
71°Jun
78°Jul
78°Aug
72°Sep
62°Oct
51°Nov
45°Dec
Annual Precip: 31.5 inAnnual Snow: 20.0 in
Best Time to Visit
JanuaryAir 45°F · Water 144°F · +99° contrast
DecemberAir 45°F · Water 144°F · +99° contrast
FebruaryAir 46°F · Water 144°F · +98° contrast
January offers 33°F more contrast than July
Nearby Camping
Letts Lake Campground8.3 mi away
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...
What is the water temperature at Bartlett Springs?
Bartlett Springs has a water temperature of 144°F (62°C). This is considered a hot spring, well above body temperature.
Where is Bartlett Springs located?
Bartlett Springs is located in Lake County, California, near Lucerne. Coordinates: 39.1830°N, 122.7000°W.
How do I get to Bartlett Springs?
Bartlett Springs has Short Walk road access (355 ft from the road).
Can I camp near Bartlett Springs?
Yes, Letts Lake Campground is located nearby (8.3 miles away).
Is it safe to soak at Bartlett Springs?
The water at Bartlett Springs reaches 144°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. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Bartlett Springs crowded?
Bartlett Springs sees varying levels of visitors depending on the season and day of the week.
What should I bring to Bartlett Springs?
Essentials for Bartlett Springs: 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.