Potomac State Forest comprises 11,535 acres and is located in Garrett County – Western Maryland. Hours of Operation: Open daily, 8 a.m. to sunset. Trail Miles: 6.7  Day Use Parking is located off of Burkholder Road. Horse Camping: No The Potomac State Forest (Backbone Mtn.) trail map is available for download when you subscribe or you can purchase the printed Western MD Read more...