Colonel Denning State Park, in north central Cumberland County, is in Doubling Gap, so named by the S turn where Blue Mountain doubles back on itself. This feature may be seen from the Doubling Gap Vista in adjacent Tuscarora State Forest. The park has 273 acres of woodland and a 3.5-acre lake.
Christine A. on Flat Rock Loop Trail
Awesome trail. Very rocky and straight up to the top. By the end of the day I logged 150 floors on my FitBit.
I workout and run, and still finished this sweaty and tired. Totally worth it though... Amazing view at the top. Make sure you bring water, one of the maps (free at the bittom) and bug spray for the ticks and mosquitos (I used Off, and even rubbed it on my face, and still the bugs were flying into my eyes and mouth, and trying to land on my face THE ENTIRE TIME, from top to bittom).
Great hike though, and the view at the top is worth it.
Great hike with an awesome view at the end (one of the best I've seen in PA). Trail is very well marked and easy to follow. I would definitely agree that this was a more difficult and strenuous hike - it takes about 45-60min to get to the top, and almost all of it is uphill (rocky, too). Bring boots and lots of water. Very well worth it once you get to the top!