Illinois Pass
USFS trail 25
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.
3.7 mi · Typical grade 12 to 20%
About 1,100 ft between the route's high and low points. An estimate from USGS elevation data, computed 2026-07-10; not measured in the field.
Trail facts
- Length
- 3.7 mi mapped
- Grade
- Typical grade 12 to 20% (USFS trail class TG05)
- Surface
- native material
- Motorized status
- Motorized use designated by the USFS
- National forest
- Arapaho and Roosevelt National Forests
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.