Colonel Denning State Park is a 273acre Pennsylvania state park in Lower Mifflin Township, Cumberland County, Pennsylvania in the United States. The park is in the Doubling Gap of Blue Mountain on Pennsylvania Route 233 between Newville and Landisburg. Doubling Gap Lake is a man-made lake covering. Colonel Denning State Park is surrounded by Tuscarora State Forest.HistoryColonel Denning State Park is named in honor of William Denning who was, oddly, never a colonel. He was a veteran of the American Revolutionary War and a manufacturer of wrought iron cannons. Denning was a sergeant in the Continental Army from March 1778 until April 1780. He was stationed near Carlisle at Washingtonburg Forge, now the Carlisle Barracks. While stationed there, Denning explored and mastered the technique of creating lighter and easier to transport cannons. He did this by welding strips of wrought iron together in layers and building the cannon with the layers. Denning lived out his life following the Revolution near Newville. His grave can be found in the cemetery of Big Spring Presbyterian Church in Newville.
