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Sweet Warm Spring earns its name honestly. At 68 degrees Fahrenheit along the Sweet Ola Highway near Emmett, this is thermal bathing for people who prefer pool temperature over hot tub temperature. Roadside access puts it just 15 meters from pavement in low-elevation Gem County.
At 2,530 feet, this is lowland Idaho. Annual air temperatures average nearly 53 degrees, the warmest ambient climate of any spring in the surrounding area. The landscape is dry foothill country with bunchgrass, sagebrush, and scattered juniper rather than the dense conifers found at higher thermal springs. The water emerges with a neutral pH of 7.2 and moderate mineralization at 580 mg/L. The sodium-dominant chemistry gives the water a faintly soft quality without the slippery feel of more alkaline springs.
History of Sweet Warm Spring
USGS measurements recorded a source temperature of 113 degrees Fahrenheit, significantly warmer than the 68-degree surface reading in the original survey, suggesting the water cools substantially as it reaches the surface pool. The neutral pH and balanced mineral content indicate circulation through mixed volcanic and sedimentary formations. Iron concentrations at 20 micrograms per liter are low, keeping the water clear rather than rust-tinted.
Sweet Warm Spring sits directly off Sweet Ola Highway with no approach required. The low elevation and relatively mild climate make this accessible nearly year-round, with minimal snowfall averaging just 33 inches annually. Swinging Bridge Campground is 27.5 kilometers away along Highway 55 and offers reservable sites. The 68-degree water temperature feels refreshing in summer heat but may feel cool in other seasons. No facilities exist at the spring.
Is Sweet Warm Spring worth visiting?
Best for
- Easy day trips
- Overnight camping trips
Sweet Warm Spring is well suited for easy day trips and overnight camping trips.
Annual Precip: 20.6 in
Annual Snow: 32.9 in
January
Air 30°F · Water 68°F · +38° contrast
December
Air 30°F · Water 68°F · +38° contrast
February
Air 36°F · Water 68°F · +33° contrast
January offers 49°F more contrast than July
Recent Temperature
113.0°F
(45.0°C)
Measured Aug 04, 1972
The water at Sweet Warm Spring is neutral (pH 7.2) with 580 mg/L total dissolved solids.
pH influences mineral absorption through skin
Higher mineral concentration for therapeutic soaking
May support bone density and joint health
Known for muscle relaxation and stress relief
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
Iron-rich springs may support circulation
Overview
Swinging Bridge Campground is located 10 miles north of Banks, Idaho just off Highway 55 at an elevation of 4,000 feet.
The North Fork Payette River flows next to the highway, where extreme kayaking is a popular activity.Recreation
The North Fork of the Payette River is a very popular location for expert kayaking. Whitewater rafting is nearby on the Main and South Fork sections of the Payette River.
Anglers will find good to excellent fishing for whitefish and rainbow trout.Facili...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Swinging Bridge
Trash bag
Pack out what you pack in
USGS Quad: (MONTOUR 15) · NOAA: 1.0 · AMS Map: BOISE
What is the water temperature at Sweet Warm Spring?
Sweet Warm Spring has a water temperature of 68°F (20°C). This is a warm thermal spring.
Where is Sweet Warm Spring located?
Sweet Warm Spring is located in Gem County, Idaho at 2,530 feet elevation, near Emmett. Coordinates: 43.9720°N, 116.3250°W.
How do I get to Sweet Warm Spring?
Sweet Warm Spring has Roadside road access, with the nearest road being Sweet Ola Highway (51 ft from the road).
Can I camp near Sweet Warm Spring?
Yes, Swinging Bridge is located nearby (17.1 miles away).
What minerals are in the water at Sweet Warm Spring?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride, Iron. The pH is 7.2 (neutral). Total dissolved solids measure 580 mg/L.
Is it safe to soak at Sweet Warm Spring?
Sweet Warm Spring is generally safe for soaking at its recorded 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 Sweet Warm Spring crowded?
Sweet Warm Spring is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Sweet Warm Spring?
Essentials for Sweet Warm Spring: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in.