Avoid using trails for 24 hours after significant rain.
Once in Black Hills Regional Park, head down the gravel road past the Boat launch, toward the Park Horse Area. The trailhead is on the left past the bridge. There is a new connector trail that heads to the back Of Schaeffer Farm that splits off close to the back of the Montgomery County Soccerplex. You can also take the paved trail around the bike park and get to the main lot at Schaeffer Farm.
The trail is quite mellow and has very little elevation gain or loss over the 6.5 miles.