W Ukinek Spring
W Ukinek Spring flows at an impressive 81 degrees Celsius (178 degrees Fahrenheit) within Becharof National Wildlife Refuge on the Alaska Peninsula, one of Alaska's hottest thermal features despite its restricted-access status. The spring emerges at 315 feet elevation in a landscape shaped by active volcanoes and wild coastlines.
The setting combines wind-swept arctic tundra, active volcanic peaks, and exposed coastline where subarctic climate dominates. At 38.1 degrees Fahrenheit annual average temperature with 42.6 inches of precipitation and 78.3 inches of snow annually, the environment is harsh and unforgiving. The water's calcium concentration of 380 milligrams per liter combined with chloride at 6,300 milligrams per liter creates mineralized thermal water that contrasts sharply with the cold, sparse surrounding landscape.
The spring lies within Becharof National Wildlife Refuge's permanently protected wilderness. Its high temperature and chemistry reflect deep thermal circulation in a region of ongoing volcanic and geothermal activity. The Alaska Peninsula's geological setting—with active volcanoes and crustal heat—drives these exceptional thermal waters to the surface.
Access is severely restricted by the U.S. Fish and Wildlife Service to protect the refuge's ecosystems and wildlife. The spring lies 22,667 meters from the nearest Jeep Trail across backcountry terrain. Public visitation is not encouraged. Researchers and authorized personnel may access the site with permits. The remote, protected status means this spring remains one of Alaska's least-visited thermal features despite its exceptional temperature.
Is W Ukinek Spring worth visiting?
Best for
- Backpacking adventures
Not ideal for
- Day trips with young children
The water at W Ukinek Spring is slightly acidic (pH 6.3). It is notably rich in calcium (may support bone density and joint health), sodium (supports circulation and skin hydration), and chloride (natural antiseptic with skin health benefits).