Flume
USFS trail 50
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.
9.8 mi · Typical grade 12 to 20%
About 500 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
- 9.8 mi mapped
- Grade
- Typical grade 12 to 20%
- Surface
- native material
- USFS-managed hiker season
- April 16 through October 31
- USFS-managed uses
- Hiking
- Motorized status
- Non-motorized (USFS designation)
- Accessibility
- Not listed by the USFS as accessible
- Designation
- National trail designation
- National forest
- Black Hills 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.
This record is a snapshot of U.S. Forest Service data retrieved on 2026-07-09. It does not reflect current closures, conditions, or seasonal orders. Check with the local ranger district before you go.
Elevation
About 730 ft of climbing one way, measured in the harder direction.
- High point
- About 4,950 ft
- Low point
- About 4,450 ft
Estimates, derived from USGS elevation data sampled along the USFS-mapped route, computed 2026-07-10. We have not measured these figures in the field.
Access points
Listed on Recreation.gov and matched to this trail by name and location, retrieved 2026-07-10. We have not visited or verified these access points.
Flume Trailheads
Set your ZIP or use your location for drive times to these access points.
Plan a day on this trail
A day here means a typical grade of 12 to 20%, inside a managed hiker season that runs April 16 through October 31. Tell the Trip Builder where you are headed and it assembles a day-specific kit with weather, daylight, and terrain in mind.
Build your kitData: U.S. Forest Service, retrieved 2026-07-09.