The Centennial Trail is over 100 miles long and was built in 1989 to represent the 100th anniversary of South Dakota's statehood. This part of the trail begins at the Highland Creek Trailhead near the Custer State Park boundary fence. You'll travel through the dense ponderosa pine forest in the rolling Black Hills, along with meadows that are near the creeks. Most people will do this route as a one-way day trip with necessary vehicle arrangements, but it can also be done as an out and back. Custer State Park requires a park entrance license for each vehicle.