|William Penn State Forest|
|Pennsylvania State Forest|
|Managed Resource Protected Area (IUCN VI)|
Antietam Creek in the Ruth Zimmerman Naural Area of William Penn State Forest in Berks County.
|Named for: William Penn|
|Counties||Chester, Delaware, Lancaster|
|- elevation||239 ft (72.8 m)|
|Area||812 acres (329 ha)|
|Managed by||Pennsylvania Department of Conservation and Natural Resources|
|Website : William Penn State Forest|
William Penn State Forest is a Pennsylvania State Forest in Pennsylvania Bureau of Forestry District #17. The main offices are located in Elverson in Chester County, Pennsylvania in the United States.
After the July 1, 2005 realignment of Pennsylvania State Forest Districts, what was then Valley Forge State Forest and District #17 acquired the northern parts of Berks and Lehigh Counties from 
William Penn State Forest is located on 812 acres (329 ha) in three tracts: 10 acres (4 ha) in Lancaster County; 200 acres (81 ha) on Little Tinicum Island in the Delaware River in Delaware County; and 602 acres (244 ha) of the Goat Hill Serpentine Barrens in Chester County. District #17 also includes Berks, Bucks, Lehigh, Montgomery, Northampton, and Philadelphia Counties.
William Penn State Forest was formed as a direct result of the depletion of the forests of Pennsylvania that took place during the mid-to-late 19th century. Conservationists like Dr. Joseph Rothrock became concerned that the forests would not regrow if they were not managed properly. Lumber and iron companies had harvested the old-growth forests for various reasons. forests and left behind nothing but dried tree tops and rotting stumps. The sparks of passing steam locomotives ignited wildfires that prevented the formation of second growth forests. The conservationists feared that the forest would never regrow if there was not a change in the philosophy of forest management. They called for the state to purchase land from the lumber and iron companies and the lumber and iron companies were more than willing to sell their land since that had depleted the natural resources of the forests. The changes began to take place in 1895 when Dr. Rothrock was appointed the first commissioner of the Pennsylvania Department of Forests and Waters, the forerunner of today's Pennsylvania Department of Conservation and Natural Resources. The Pennsylvania General Assembly passed a piece of legislation in 1897 that authorized the purchase of "unseated lands for forest reservations." This was the beginning of the State Forest system.
The first parcel of land that became William Penn State Forest was acquired in 1935 when the state bought 10 acres (4 ha) of land in Lancaster County from the heirs of the Cornwall Iron Furnace fortunes. The first 10 acres (40,000 m2) contained the Cornwall fire tower which was built in 1923. The second land acquisition did not take place until November 1982 when Little Tinicum Island in the Delaware River was purchased at a cost of $100,000. In December 1982 a second tract of land was purchased. The Goat Hill Serpentine Barrens, consisting of 602 acres (244 ha), were purchased for $239,500 with financial aid from the Nature Conservancy. Both Little Tinicum Island and the Goat Hill Serpentine Barrens are home to unique ecological habitats.
Neighboring state forest districts
Nearby state parks
Although no state parks are located within William Penn State Forest, there are fifteen state parks in District #17:
- Delaware Canal State Park (Bucks and Northampton Counties)
- Evansburg State Park (Montgomery County)
- Fort Washington State Park (Montgomery County)
- French Creek State Park (Berks County)
- Marsh Creek State Park (Chester County)
- Neshaminy State Park (Bucks County)
- Nockamixon State Park (Bucks County)
- Nolde Forest Environmental Education Center (Berks County)
- Norristown Farm State Park (Montgomery County)
- Ridley Creek State Park (Delaware County)
- Benjamin Rush State Park (Philadelphia County)
- Ralph Stover State Park (Bucks County)
- Susquehannock State Park (Lancaster County)
- Tyler State Park (Bucks County)
- White Clay Creek Preserve (Chester County)
- "William Penn State Forest".
- "DCNR REALIGNING FOREST DISTRICTS". Pennsylvania Department of Conservation and Natural Resources. June 2005. Retrieved 2006-07-14.
- "State Forest Districts". Pennsylvania Department of Conservation and Natural Resources. Archived from the original on 2006-05-15. Retrieved 2006-07-14. Note: Map showing districts after the July 1, 2005 realignment
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division. "2007 General Highway Map Chester County Pennsylvania". Retrieved 2007-09-05. Note: shows William Penn State Forest in West Nottingham Township.
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division. "2007 General Highway Map Delaware County Pennsylvania". Retrieved 2007-09-05. Note: shows William Penn State Forest in Tinicum Township.
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division. "2007 General Highway Map Lancaster County Pennsylvania". Retrieved 2007-09-05. Note: shows William Penn State Forest in Penn Township as an unlabeled green area, north of Interstate 76 and on a road in Pennsylvania State Game Lands Number 156.