Castle Rock Snomo
USFS trail 503
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.
17.5 mi · Typical grade 0 to 5%
About 150 ft between the route's high and low points. An estimate from US government elevation data, computed 2026-07-10; not measured in the field.
Trail facts
- Length
- 17.5 mi mapped
- Grade
- Typical grade 0 to 5%
- Surface
- snow
- Designation
- National trail designation
- National forest
- Hiawatha 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.