This connects the east and west parking lots. Follow the purple blazes. This area has many trails and even more (and confusing) connectors so looking at the posted maps or using the Trail Run Project mobile app
From the east lot, you can take the Stubblefield Falls Overlook Trail
north to the overlook and cut right through the center of the nature preserve.
From the west lot, follow the Potomac Heritage Trail north to the Scott's Run Waterfall