South Dakota trails · Flume
Flume
A 9.8-mile out-and-back in South Dakota, with 513 ft of climbing. Reaches Air Force Vista. Managed by the U.S. Forest Service.
Elevation profile
Most of the climbing sits in the first third — 66% of the ascent, between mile 0.0 and mile 3.3. It gives back about 703 ft along the way, so it rolls rather than climbing steadily.
3-D terrain
USGS 3DEP ELEVATION × ESRI WORLD IMAGERY · VERTICAL ×1.5
Reaches
- Air Force Vista (viewpoint)
Getting there
COON HOLLOW — parking nearby, restroom, water. 43.95506, -103.36877 · directions
Daylight at the trailhead
On August 31, 2026 — the day this page was generated — first light reaches this trailhead at 5:45 a.m., the sun rises at 6:15 a.m. and sets at 7:31 p.m., and the last usable light fades about 8:01 p.m. (MDT) — 13 h 16 min of daylight. At about 2.7 mph plus 30 minutes per 1,000 feet of climbing, the 19.6-mile round trip takes roughly 7 h 46 min, so leaving the trailhead at sunrise puts you back around 2:01 p.m. — 5 h 30 min before sunset.
Loop options
- FLUME + FLUME LOOP B — 3.8 mi loop, 368 ft gain
Nearby trails
- Centennial On Mystic — 4.6 mi
- Victoria 13 — 5.1 mi
- Centennial On Hell — 7.0 mi
- Lost Cabin #2 — 9.3 mi