Arling Hot Spring surfaces at 90 degrees Fahrenheit near Cascade, Idaho, placing it on the cooler end of the thermal spectrum. Its highly alkaline water, with a pH of 9.8 and low mineral content, distinguishes it chemically from the region's hotter springs. Roadside access at 4,860 feet elevation makes it a quick stop in Valley County.
The spring sits in a mountain valley corridor west of Cascade, surrounded by mixed conifer forest typical of central Idaho's mid-elevations. At nearly 4,900 feet, winters bring over 11 feet of snow, blanketing the landscape from November through March. The sodium-dominant, soft water emerges clear with minimal dissolved solids at 218 parts per million. Nearby Lake Cascade stretches across the valley floor, visible through gaps in the ponderosa and Douglas fir.
History of Arling Hot Spring
Arling Hot Spring rises along a fault zone in the Idaho Batholith, the same massive granitic intrusion responsible for dozens of thermal features across central Idaho. The batholith formed roughly 75 to 100 million years ago, and deep-circulating groundwater heated by residual geothermal energy feeds springs throughout the region. Valley County holds one of the highest concentrations of thermal springs in the state.
The spring lies about 100 meters from the road, making access straightforward in dry months. Amanita Campground at Lake Cascade sits roughly 10 miles away and accepts reservations. Winter access depends on road conditions, as the area receives heavy snowfall. Water temperature hovers near body heat, so expect a lukewarm soak rather than a steaming pool.
Is Arling Hot Spring worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Arling Hot Spring is well suited for warm-water soaking and easy day trips.
Annual Precip: 33.6 in
Annual Snow: 143.6 in
December
Air 23°F · Water 90°F · +67° contrast
January
Air 25°F · Water 90°F · +65° contrast
February
Air 27°F · Water 90°F · +63° contrast
December offers 45°F more contrast than August
Recent Temperature
92.5°F
(33.6°C)
Measured Jul 18, 1991
The water at Arling Hot Spring is alkaline (pH 9.8) with 218 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
Overview
Amanita Campground is located next to scenic Lake Cascade in west-central Idaho. It is near the town of Donnelly, at an elevation of 4,850 feet. Boating, fishing, swimming and hiking are popular activities in this scenic region.
Recreation
Lake Cascade offers excellent opportunities for boating, water skiing, canoeing, windsurfing and sailing. Anglers enjoy casting for rainbow trout, coho salmon, smallmouth bass and perch. A boat ramp is located at the neighboring Rainbow Point Campg...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Warm layers
Cold air before and after soaking
Camping gear
Nearby camping at Amanita
Trash bag
Pack out what you pack in
USGS Quad: CASCADE 15 · PP 492: 27.0 · NOAA: 5.0 · AMS Map: BAKER
What is the water temperature at Arling Hot Spring?
Arling Hot Spring has a water temperature of 90°F (32°C). This is a warm thermal spring.
Where is Arling Hot Spring located?
Arling Hot Spring is located in Valley County, Idaho at 4,860 feet elevation, near Cascade. Coordinates: 44.6400°N, 116.0450°W.
How do I get to Arling Hot Spring?
Arling Hot Spring has Roadside road access (328 ft from the road).
Can I camp near Arling Hot Spring?
Yes, Amanita is located nearby (6.0 miles away).
What minerals are in the water at Arling Hot Spring?
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 9.8 (alkaline). Total dissolved solids measure 218 mg/L.
Is it safe to soak at Arling Hot Spring?
Arling Hot 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 Arling Hot Spring crowded?
Arling Hot 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 Arling Hot Spring?
Essentials for Arling Hot Spring: swimsuit, towel, water bottle, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in.