The Mackie Run Shelter in the Mont Alto State Forest (now Michaux State Forest) in Pennsylvania, was built in 1936, with the assistance of the Civilian Conservation Corps (CCC). Unlike other lean-to style shelters built in the area at this time, the Mackie Run shelter was built as a single structure rather than as a pair of smaller shelters. The Mackie Run shelter no longer exists. It was one of many shelters removed or relocated because it was too close to a road and thus too easily accessible to non-hikers. The Deer Lick Run Shelters, approximately one mile north, replaced the Mackie Run Shelter in this stretch of the Trail.