The ride is 90% singletrack and tends to be quite technical. Expect some good climbs, tight switchbacks, flying descents, tons of stream crossings and a trail that goes on seemingly forever. Only a handfull of people in the world have what it takes to do the full ride.
The The Flume Trail is at the West end of the boat lauch parking lot. Follow the Flume Trail along the lake endge to the intersection with the Centennial Trail. The Centennial Trail is a 100+ mile trail so just ride it as an out and back as far as you want to go.
How to get there:
Located in the Black Hills National Forest. From Rapid City head West on Route 16. Then follow 385 to the Sheridan Lake Campground. Park near the boat launch.
Camping is available at the Sheridan Lake Campground