Leatherman Peak: Driving the vertical Sawmill Gulch Road in Idaho
Leatherman Peak is a high mountain summit located in Custer County, in the US state of Idaho. A grueling gravel road climbs its western flank to reach 2,742m (8,996ft) above sea level, making Forest Road 411 (Sawmill Gulch Road) one of the highest roads of Idaho.
| Road facts: Leatherman Peak (FR 411) | |
|---|---|
| Location | Custer County, Idaho (USA) |
| Road Name | Forest Road 411 / Sawmill Gulch Road |
| Length | 2.9 miles (4.7 km) |
| Elevation at Summit | 2,742 m (8,996 ft) |
| Average Gradient | 15.80% |
| Surface | 100% unpaved (loose gravel, embedded rocks) |
| Vehicle Requirements | High-clearance 4x4 with low-range gearbox mandatory |
How technical is the 15.80% climb on the Sawmill Gulch Road?
The journey starts at the junction with US-93 and gains 743 meters of elevation in just 4.7 kilometers. With an average gradient of 15.80%, several sections feature even steeper ramps over loose gravel and rocky outcrops. Maintaining momentum on the tight hairpins is critical to avoid spinning out on the loose surface.
Is Sawmill Gulch Road open year-round?
No. Located in the Salmon-Challis National Forest within the Lost River Range, the road is buried under heavy snow for most of the year and typically remains impassable until mid-summer. Rockfalls and water erosion during the spring thaw regularly alter the track condition.
What are the main hazards on Forest Road 411?
Extremely steep grades, sharp stones capable of puncturing tires, severe isolation, and no cell coverage are the primary hazards. On the descent back to US-93, relying solely on foot brakes will cause rapid overheating and brake fade; low-range engine braking is required to control speed.
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