Thunder Mountain Historic
Thunder Mountain Historic Trail is a 16.9 miles trail in Salmon-Challis National Forest, Idaho. The Forest Service rates it trail class 2, moderately developed. It is open to hiking, horse and pack stock and mountain biking.
Trail conditions, closures and hazards are not tracked here. The Salmon-Challis National Forest official page carries current alerts and closure orders.
Map
One end Other endLine simplified to about 100 metres. Basemap from the USGS National Map.
| One end | 45.0091, -114.0233 · Directions ↗ |
| Other end | 44.9521, -114.2737 · Directions ↗ |
The ends are the two ends of the longest connected chain of segments. The record does not say which is the usual start. The trail is recorded as 4 segments.
The trail
| Length | 16.9 miles |
| Trail class | 2, moderately developed |
| Type | land trail |
| Surface | native material |
| Typical grade | 5-8 percent |
| Typical tread width | 18-24 inches |
| Motor vehicles | Closed to all motorized use year-round |
| Accessibility | Not evaluated |
| Trail numbers | 6040 |
| Forest | Salmon-Challis National Forest (unit 0413) |
| States | Idaho |
| Detail published | management level, with uses |
Values are the set across all segments. Class 1 is minimally developed and class 5 is fully developed. Grade and width are the forest's typical values, not measured extremes.
Weather by month
Allowed uses
| Hiking | Allowed year-round |
| Horse and pack stock | Allowed 06/15 to 11/15 (month/day) |
| Mountain biking | Allowed year-round |
A use is listed when the Forest Service records it as managed, accepted or discouraged on any segment. Discouraged still means legal. Uses marked restricted are left out. Where the forest publishes a Motor Vehicle Use Map, that map governs motorized use.
Trailheads
The Forest Service recreation layer records no trailhead within a third of a mile of this trail's line. Many trails start from a road pullout or another trail with no trailhead record. The forest's recreation pages list the trailheads it does publish.
Camping nearby
Campsite Atlas cards carry site counts and booking links from Recreation.gov. Forest Service cards come from the recreation layer and link the agency page.
Fire nearby
- WildfireDoublesprings
48 mi from the trail midpoint · 1,779 acres · 70% contained
Distance is to the reported incident point, not the fire edge. Closure orders are on the forest's official page.
Reference
Questions people ask
How long is the Thunder Mountain Historic Trail?
16.9 miles, the sum of the 4 segments the Forest Service records under this name in Salmon-Challis National Forest.
Source: Forest Service trail layer
What is allowed on the Thunder Mountain Historic Trail?
hiking, horse and pack stock and mountain biking. The trail is closed to motor vehicles year-round. Some uses are seasonal. The allowed uses section lists the dates.
Source: Forest Service trail layer
Where does the Thunder Mountain Historic Trail start?
The line begins at 45.0091, -114.0233 and ends at 44.9521, -114.2737. No Forest Service trailhead is recorded within a third of a mile of it. The record does not say which end is the usual start.
Source: Forest Service trail layer
Is the Thunder Mountain Historic Trail in a wilderness area?
No. The trail line does not cross any polygon in the National Wilderness Preservation System layer.
Source: Wilderness Connect
Where can I camp near the Thunder Mountain Historic Trail?
Williams Lake Campground (1.8 mi), Williams Lake Campground (3 mi) and Williams Lake Campground (3 mi) are within five miles of the trail. Site counts and booking links are on Campsite Atlas.
Source: Campsite Atlas
How developed is the Thunder Mountain Historic Trail?
Trail class 2, which the Forest Service describes as moderately developed. Class 1 is a minimal, unimproved route and class 5 is fully developed, often paved.
Source: Forest Service trail layer
How steep and how wide is the Thunder Mountain Historic Trail?
The typical grade is 5-8 percent. The typical tread is 18-24 inches wide.
Source: Forest Service trail layer
Who manages the Thunder Mountain Historic Trail?
Salmon-Challis National Forest, Forest Service unit 0413. The trail is in Idaho.
Is there a fire near the Thunder Mountain Historic Trail?
1 active incident within 50 miles of the trail midpoint as of 2026-09-18, the nearest Doublesprings at 48 miles. Check the forest's closure orders before you go.
Source: Fire nearby
Source
This page is built from 4 segments named THUNDER MOUNTAIN HISTORIC in the Forest Service TrailNFS_Publish layer, administrative unit 0413. Wilderness overlap is tested against the National Wilderness Preservation System layer from Wilderness Connect. Trailheads and Forest Service campgrounds come from the Forest Service Recreation Opportunities layer. Data refreshed September 17, 2026. The methodology page explains how segments become trails.