• Photo of Lemon House, Level #6, and Engine House on a beautiful summer day.

    Allegheny Portage Railroad

    National Historic Site Pennsylvania

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  • Road Closure

    Please be aware that part of the public area loop has been closed until further notice as the park starts preparatory efforts for this summer's paving project on the Picnic Area Road.

Environmental Factors

Plant, animal, and other living organisms in an ecosystem are influenced not only by each other, but also by nonliving factors such as the chemistry of the air, soils, and water. At Allegheny Portage Railroad NHS, monitoring of the air and water protect the natural integrity of the park and provide information about the ground and air chemistry of the surrounding area. Efforts are also made to correct the inadvertent shifts in the natural communities that came about as a result of mining and nonnative species introduction. Natural plant communities are restored and preserved by combating exotic, invasive species that infest the park.

Monitoring in the Context of Climate Change

Forest Vegetation Resource Brief

Did You Know?

Eastern Hemlock needles

In 1834, a passenger on the Portage wrote that the engine houses appeared "like fairy castles seated on the tops of lofty hills, and shaded and surrounded by towering oaks and hemlocks". Today, a new generation of hemlock, Pennsylvania's state tree, survives in Allegheny Portage Railroad NHS.