Treasureton Hot Springs
Treasureton Hot Springs surfaces at 95°F near Preston in Franklin County, but recent USGS measurements found subsurface temperatures reaching 76°C (169°F), indicating a powerful geothermal source. The water is heavily mineralized with 630 mg/L chloride and 490 mg/L sodium — among the highest mineral concentrations in Idaho's thermal springs.
The spring sits at 4,900 feet in the Cache Valley foothills of southeastern Idaho, where irrigated farmland transitions into dry grass and sagebrush slopes along the Bear River Range front. North State Highway 34 passes about 236 meters from the spring. The area receives 82.6 inches of annual snow and averages 46.7°F, producing cold winters typical of the upper Cache Valley. The landscape is more pastoral than wild — agricultural fields and small ranching communities define the surrounding terrain.
The spring is a short walk from Highway 34, making it accessible year-round by vehicle, though winter conditions bring snow and cold. At 95°F the surface water is comfortable for soaking, but subsurface temperatures may be significantly hotter — exercise caution around the source. Maple Grove Campground, about 6 km away, provides 12 first-come sites at $5 per night with a 14-day limit. Bring supplies, as Preston is the nearest town with services.
The name references the nearby community of Treasureton, a small settlement in Franklin County with roots in the late 19th-century Mormon colonization of the Cache Valley. Franklin County was among the first areas of Idaho settled by Euro-Americans, with the town of Franklin established in 1860. The springs have likely been known since early settlement, though specific development history is not well documented in public records.
The water at Treasureton Hot Springs is slightly alkaline (pH 7.3). It is notably rich in sodium (supports circulation and skin hydration), sulfate (traditionally used for skin conditions and inflammation), and chloride (natural antiseptic with skin health benefits).
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Campground rules and regulations are posted at the site. There are no dumpsters on site, visitors must pack in and out their trash. Campsites: 12 developed sites--- At this time, there is not a reservation system in place for the campsites. Campsites are on a first come first serve basis. Overnight Camping Fees: $5.00 per vehicle/ per night This site is equipped picnic tables, fire rings, vault toilets, horseshoe pits, and boat ramp with a dock. There is no Day-use allowed and facilities a...
Treasureton Hot Springs is road-accessible, so you can bring more gear.
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