High Quality Content by WIKIPEDIA articles! McConnells Mill State Park is a 2,546 acres (1,030 ha) Pennsylvania state park in Perry and Slippery Rock Townships, Lawrence County, Pennsylvania in the United States. The park features a deep scenic gorge with the restored watermill and a covered bridge at the bottom, accessible by a roadway that winds between large, room-sized boulders on the hillside. McConnells Mill State Park is along the Slippery Rock Creek just southwest of the intersection of US 422 and US 19.