Copper Basin Loop Rd Fr-138
USFS trail SNO-4446
The route in 3D
Fly this trail over real terrain
USGS and partner elevation data build the terrain, and the US Forest Service centerline draws the route.
17.6 mi · Typical grade 5 to 8%
About 750 ft between the route's high and low points. An estimate from US government elevation data, computed 2026-07-11; not measured in the field.
Trail facts
- Length
- 17.6 mi mapped
- Grade
- Typical grade 5 to 8% (USFS trail class TG02)
- Surface
- native material
- Designation
- National trail designation
- National forest
- Salmon-Challis National Forest
Length is the trail as the Forest Service maps it, not a trip distance. Hike out and back and you will cover it twice; check the shape of the route before you count on the figure.