Twenty Mile Spur Trail
USFS trail SNO-51734
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.
1.3 mi · Typical grade 10 to 12%
About 100 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
- 1.3 mi mapped
- Grade
- Typical grade 10 to 12% (USFS trail class TG04)
- Surface
- snow
- Designation
- National trail designation
- National forest
- Tongass 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.