The Forrest H. Duttlinger Natural Area is a protected area

Protected area

Protected areas are locations which receive protection because of their recognised natural, ecological and/or cultural values. There are several kinds of protected areas, which vary by level of protection depending on the enabling laws of each country or the regulations of the international...

 in Clinton County

Clinton County, Pennsylvania

As of the census of 2000, there were 37,914 people, 14,773 households, and 9,927 families residing in the county. The population density was 43 people per square mile . There were 18,166 housing units at an average density of 20 per square mile...

, Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

 that includes a 158 acres (63.9 ha) old-growth forest of Eastern Hemlock

Eastern Hemlock

Tsuga canadensis, also known as eastern or Canadian hemlock, and in the French-speaking regions of Canada as pruche du Canada, is a coniferous tree native to eastern North America. It ranges from northeastern Minnesota eastward through southern Quebec to Nova Scotia, and south in the Appalachian...

, American Beech

American Beech

Fagus grandifolia, also known as American Beech or North american beech, is a species of beech native to eastern North America, from Nova Scotia west to southern Ontario in southeastern Canada, west to Wisconsin and south to eastern Texas and northern Florida in the United States. Trees in the...

, Black Cherry, Sugar Maple

Sugar Maple

Acer saccharum is a species of maple native to the hardwood forests of northeastern North America, from Nova Scotia west to southern Ontario, and south to Georgia and Texas...

, and Northern Red Oak

Northern Red Oak

Quercus rubra, commonly called northern red oak or champion oak, , is an oak in the red oak group . It is a native of North America, in the northeastern United States and southeast Canada...

. There are also Eastern White Pine

Eastern White Pine

Pinus strobus, commonly known as the eastern white pine, is a large pine native to eastern North America, occurring from Newfoundland west to Minnesota and southeastern Manitoba, and south along the Appalachian Mountains to the northern edge of Georgia.It is occasionally known as simply white pine,...

s, but a few were selectively logged around 1900. The largest tree is an Eastern Hemlock, 43 inches (109.2 cm) diameter at breast height

Diameter at breast height

Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements....

and 112 feet (34.1 m) tall.

The old-growth forest once lay on the boundary of two lumber companies, the Goodyear and Lackawanna, but was apparently spared because of a dispute over a surveying error.