Green Ridge Forest State Park is one of the largest state forests in Maryland, spanning 47,000 acres. The park boasts numerous hiking trails, fishing along the Potomac River, and hunting.
There are 100 primitive campsites throughout the forest, each equipped with a picnic table and fire ring. To use a campsite, you must register in person at the forest headquarters at 28700 Headquarters Drive NE, Flintstone, MD 21530. The fee to stay is $10 per night, payable only in cash or check.
Fifteen Mile Creek earns its moderate rating due to the two deep fords at the trail's north end. Other than the water crossings, the trail is easy. The north end of the road starts just over the Mason-Dixon line in Pennsylvania and finishes up winding it's way around a mountain deep in the forest.