Unnamed Thermal Spring
This unnamed 77°F spring emerges 20.4 degrees above the 56.6°F ambient temperature in Millard County near Delta, flowing at 4,415 feet elevation on BLM public land administered by the Fillmore Field Office. The source sits 1,386 meters from the nearest road, requiring a substantial walk across desert terrain. Public access is open.
The spring occupies the Sevier Desert basin where annual precipitation totals just 6 inches with 14.8 inches of snow—one of Utah's driest environments. Vegetation consists of salt-tolerant shrubs including shadscale and greasewood on alkaline soils. The flat basin topography extends for miles with distant mountain ranges visible on all horizons. Land use is minimal: BLM rangeland with occasional grazing activity.
No historical name is documented for this spring. The Sevier Desert provided seasonal resources for Indigenous groups including Goshute and Paiute peoples. Euro-American exploration began in the mid-19th century with the Old Spanish Trail. Delta was established as an agricultural town in 1906 following irrigation development. This spring has no recorded development history.
Access requires a 1.4-kilometer walk from parking across open desert. Visit spring or fall to avoid temperature extremes. Bring all supplies; the nearest services are in Delta. The spring's 77°F temperature provides warmth but not hot-soaking heat. No facilities or established trails exist. GPS and navigation skills essential for approach.