Quick FactsOverview
About Mollys Hot Spring
Mollys Hot Spring, Idaho is a free primitive geothermal spring in the Boise National Forest in Valley County, approximately 28 miles northeast of Cascade near the South Fork Salmon River. Hot mineral water emerges from multiple points on a hillside at up to 120 degrees Fahrenheit and is directed through pipes into seasonal pools with sandy bottoms. Visitors can control pool temperature by combining flow from hot and cool sources. Cascade, a mountain town on Highway 55, is the nearest community with services.
The spring was locally nicknamed "The Duke" because actors John Wayne and Robert Mitchum reportedly used it as a favorite soaking spot while filming in the area. The hillside features a travertine formation with multiple hot water sources, and visitors have improved the main pool over the years using logs and pipes. A jacuzzi tub has been piped in at one source point. The water has a faint sulfur scent. This is one of several free hot springs Idaho offers in the Warm Lake area of the Boise National Forest, alongside Trail Creek Hot Springs and Vulcan Hot Springs.
The pools are primitive and seasonal. A bridge crosses the river near the spring, so no fording is required.
Location & Access
Getting to Mollys Hot Spring
Mollys Hot Spring is reached by a 0.4-mile trail from a parking area along Forest Road 474 in the Boise National Forest. The last part of the trail is steep and may be difficult for some visitors. Sturdy shoes are recommended. A bridge crosses the river nearby, so no fording is required.
From Cascade, drive east on State Highway 55, then turn onto Warm Lake Road (NF-22). Follow Warm Lake Road for 23.7 miles to Forest Road 427 (Stolle Meadow Road), located between mileposts 56 and 57, approximately 4.3 miles past the Trail Creek Hot Springs pullout. The forest road is unpaved. Standard vehicles can make the drive in dry summer conditions.
Regional Context
The Warm Lake area of the Boise National Forest has a concentration of hot springs within a relatively short drive. For visitors seeking hot springs near Cascade, Trail Creek Hot Springs (roadside, concrete-fortified pools with temperature-regulating pipes) is the most accessible and popular option along Warm Lake Road. Vulcan Hot Springs (190-degree source, 0.75-mile hike from Stolle Meadows) and Ground Hog Hot Springs (100 degrees, 3.5-mile hike from Boiling Springs) offer additional backcountry soaking in the same region.
Suitability & Accessibility
Who Should Visit Mollys Hot Spring
Mollys Hot Spring suits visitors exploring the Warm Lake area who want a primitive soaking experience with character and history. The ability to control pool temperature by combining hot and cool water sources makes this one of the more adjustable wild springs in the area. The 0.4-mile trail is short but steep at the end, so moderate fitness is helpful.
The spring is best visited from late spring through early fall when the forest road is passable and water conditions support comfortable soaking. The Hollywood connection with John Wayne and Robert Mitchum adds a layer of quirky history. Shoreline Campground, approximately 3 miles away, provides the nearest developed overnight option. Hotels are available in the town of Cascade.
Accessibility at Mollys Hot Spring
The spring is not wheelchair accessible. The steep final section of the 0.4-mile trail prevents easy access. No facilities exist at the spring. Those exploring free hot springs Idaho offers near Cascade who want easier access should visit Trail Creek Hot Springs (roadside on Warm Lake Road, established pools) or Gold Fork Hot Springs (developed commercial facility near Donnelly with no hiking required and maintained pool temperatures year-round, making it the most comfortable option in the area for visitors with limited mobility).
Safety & Etiquette
Mollys Hot Spring Safety Tips
Mollys Hot Spring has source water emerging at up to 120 degrees Fahrenheit, which is hot enough to cause burns. Always test pool temperature before entering. The source points on the hillside are dangerously hot. Use the piped water system to fill pools with a mix of hot and cool water, and wait for pools to reach a comfortable temperature before soaking.
The steep section of the trail requires careful footing, especially when wet. The hillside around the springs can be slippery. Wear sturdy shoes with good traction. The bridge to cross the river is stable but may be narrow.
Wildlife and Environmental Awareness
Black bears are active in the Boise National Forest. Make noise on the trail and store food properly. The forest setting supports moose, elk, and deer. Ticks are present in spring and early summer. The nearest medical facilities are in Cascade, approximately 28 miles southwest by forest road.
Leave No Trace at Mollys Hot Spring
Pack out all trash. Do not damage the pipe system, logs, or tub that visitors have installed over the years. These are community improvements. Do not use soap or shampoo in the pools. Follow all Boise National Forest regulations. Cell service is not available in the Warm Lake area. Carry a satellite communication device and a first aid kit for emergencies. The forest road to the spring can be rough, and a breakdown in this remote area would require significant time to resolve. Ensure your vehicle is in good condition with a full tank of fuel before departing from Cascade.
