Deer Hot Springs
Deer Hot Springs, better known locally as Skinny Dipper's Hot Springs, reaches 176 degrees Fahrenheit at the source, making it one of the hottest springs along the Banks-Lowman corridor in Boise County. A short walk of about 360 feet from the road leads to this well-known thermal feature at 3,120 feet elevation.
The spring emerges on a hillside above the South Fork Payette River, where the outflow cascades down through a series of pools that cool the water to varying temperatures. Ponderosa pine and mixed conifers provide partial shade, and the river runs audibly below. Mineral deposits stain the rock in shades of white, yellow, and rust. The setting feels exposed on the upper slope but increasingly sheltered as the pools descend toward the river. Annual snowfall approaches seven feet, and the spring steams dramatically in cold weather.
The 176-degree source temperature and chemistry, 120 mg/L sodium, 88 mg/L sulfate, and 39 mg/L chloride, indicate deep circulation through the granitic Idaho Batholith before the water rises along fault lines. The slightly alkaline pH of 8.2 is lower than many neighboring springs, possibly reflecting mixing with shallow groundwater. The Skinny Dipper's name dates to the area's long informal tradition of clothing-optional soaking, established well before the Banks-Lowman corridor saw significant traffic.
The source at 176 degrees Fahrenheit causes severe burns instantly. Only the lower, cooled pools are safe for soaking, and temperatures vary, so test carefully. This spring sees heavy use on summer weekends and the clothing-optional tradition persists. Swinging Bridge Campground is about 6.5 miles away off Highway 55 and accepts reservations. Banks-Lowman Road provides access, with the trailhead unmarked but well-worn.
Is Deer Hot Springs worth visiting?
Best for
- Observing powerful hot springs
- Overnight camping trips
Not ideal for
- Casual soaking
The water at Deer Hot Springs is slightly alkaline (pH 8.2).
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...