Unnamed Thermal Spring
A 70°F warm spring at 4,096 feet elevation in Malheur National Wildlife Refuge, running just 20 degrees above the 50.3°F ambient air temperature. The spring sits approximately 2.5 miles from South Harney Lake Lane, requiring a substantial hike across restricted refuge lands. US Fish and Wildlife Service limits public access to protect sensitive wetland habitat critical for migratory birds.
The spring emerges within the Harney Basin's high desert wetland system at 4,096 feet, surrounded by seasonal marshes, alkali flats, and sagebrush uplands. The area receives just 11.6 inches of annual precipitation and 21.7 inches of snow, characteristic of the northern Great Basin. Average annual air temperature reaches 50.3°F. The modest thermal output creates localized habitat conditions that support wildlife during winter months when most surface water freezes, though the temperature differential is less pronounced than the refuge's hotter springs.
Malheur National Wildlife Refuge was created in 1908 by President Theodore Roosevelt to safeguard Pacific Flyway wetlands crucial for waterfowl migration. The refuge's thermal features have attracted wildlife and human populations for millennia, with the Harney Basin showing extensive archaeological evidence of Indigenous occupation and resource use. Current federal protection status ensures permanent conservation while allowing limited wildlife-dependent activities under strict Fish and Wildlife Service oversight.
Access requires advance permission from Malheur NWR headquarters. The 2.5-mile distance from the nearest road crosses unimproved wetland terrain that can be challenging to navigate. Seasonal closures protect nesting birds, typically March through July. The relatively cool 70°F temperature produces minimal thermal contrast in the desert environment. Bathing is not permitted. Winter visits face extreme cold and potential road closures. Bring navigation tools, adequate water, and appropriate gear for high desert conditions.