Black Hills National Forest · South Dakota, Wyoming

Flume

9.8 mi of trail, end to end · native material surface · trail No. 50 · trail class 3 · typical grade 12-20% · tread 24-36 inches wide · hiking, bike · seasonal: hiking 04/16-10/31

Trailheads Boulder Hill Trailhead Drive there · Coon Hollow Trailhead Drive there

Boulder Hill Trailhead the Forest Service's write-up

From Rapid City, travel south on Rushmore Road (turns into Highway 16) for 13 miles, then turn northeast (right) onto Silver Mountain Road. Travel for 0.1 miles then turn north (left) onto Boulder Hill Road. Travel for 2.2 miles, the trailhead will be on the east (right) side of the road. This trailhead is located on Boulder Hill Road about halfway between Sheridan Lake Road and Highway 16. This trailhead is the closest access to Loop B and the Boulder Hill overlook.

This trailhead on fs.usda.gov

Coon Hollow Trailhead the Forest Service's write-up

From Rapid City, travel south on Mt. Rushmore Road (turns into Highway 16) for 12 miles. At the town of Rockerville, exit onto Silver Mountain Road southwest (right). Travel 0.2 miles to the trailhead. this is the easternmost trailhead of the Flume Trail.

This trailhead on fs.usda.gov

Flume Trailheads (Trail #50) the Forest Service's write-up

The Flume Trail has been designated a National Recreation Trail because of its historical significance to the local people. The historic Flume trail takes you back in time to the mining boom of the 1880s. The Rockerville Flume carried water 20 miles, from Spring Creek west of the present day Sheridan Lake, east to the placer diggings near Rockerville. The flume operated until 1885, and enabled miners to take over $20 million in gold. The trail follows the actual flume bed for much of its length. Along the way you’ll see historic artifacts, tunnels, and parts of the flume itself. Please treat these historic objects with respect, and leave them in place so that others who follow can enjoy this rich history of the Black Hills.

This trailhead on fs.usda.gov

Every trail in Black Hills National Forest

Other trails from the same trailheads

All 535 trails in Black Hills National ForestFind a trailForest on fs.usda.gov

About this trail's facts

The lines are the US Forest Service's National Forest System trails layer (public domain), read 2026-10-16 and simplified for the map; the length is the line's, end to end, and the class, surface, grade and tread width are the forest's own entries where it publishes them - a forest that publishes the centreline alone has none. The trailheads and the points along the way are the Service's recreation points, and the write-ups its own recarea text, unedited. Heights come from USGS 3DEP through Terrain Tiles on AWS (Mapzen/Tilezen), read along each line and rounded; a short trail on steep ground can be off by a few tens of feet. Closures change: check the forest's own site before you go.