Ricketts Glen State Park is one of the state's largest and most scenic parks. The park is famous for the Glens Natural Area with twenty-two named waterfalls and an old-growth hemlock-White Pine forest. The park also contains Lake Jean, several small conifer swamps and shrub/scrub wetlands in headwater areas on top of the plateau. State Game Lands 57 adjoins the park and contains Crevelling Lake area. State Game Lands 13 (Splasdam Pond) is a large area with greatly diversified habitat. The undisturbed nature of Splashdam Pond and the surrounding areas make it an ideal habitat for nesting waterfowl. (Ricketts Glen State Park 717-477-5675, PGC NE Region 570-675-1143).
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This IBA was merged into the Loyalsock-North Mountain Forest Block IBA in 2013.
Due to the large expanses of unfragmented forest this site contains numerous breeding forest-interior and area-sensitive species. Over 75 breeding species have been recorded. Fairly common examples include Pileated Woodpecker, Barred Owl, Brown Creeper, Magnolia Warbler, Black-throated Blue Warbler and Black-throated Green Warblers, etc. Swainson's Thrush is a possible breeder.Breeding waterfowl include Green-winged Teal and Hooded Merganser.
Lake Jean is a spring-fed articifial lake and is affected by acid rain. Recreational overuse, inappropriate development, and overgrazing by deer are the park's greatest threats.
Old-growth forest in the Glen is designated as a registered National Landmark: The Glens Natural Area. Over 48,000 adjacent acres are now state game land, which have been timbered and managed intensively for resources. There are low-impact hiking trails which provide the only access to large sections of the park. Much of the northern and northeastern sections receive little visitor traffic. Tree pests and diseases threaten the health and vitality of this plateau forest. Wooley adelgids and beech blight are threats.