North O'Brien Loop
USFS trail 122
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.
4.1 mi · Typical grade 12 to 20%
About 600 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
- 4.1 mi mapped
- Grade
- Typical grade 12 to 20%
- Surface
- native material
- USFS-managed hiker season
- May 16 through November 30
- Motorized status
- Non-motorized (USFS designation)
- Designation
- National trail designation