Tiadaghton State Forest is comprised of 146,539 acres mostly in Lycoming County. Other tracts extend into Tioga, Sullivan, Potter, Clinton, and Union counties. Tiadaghton's forest features high-country flats bisected by clean, fast-moving mountain streams, including the legendary Pine Creek and Slate Run. It is one of eight state forests located in the PA Wilds region.
Most of the land for the Tiadaghton State Forest was purchased between 1900 and 1935 from lumber companies that had removed the timber and wanted to dispose of the cut-over land. The Civilian Conservation Corps had seven camps within the Tiadaghton State Forest during the 1930's. The corps constructed and improved the extensive road system and built foot trails and other facilities.