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

    Allegheny Portage Railroad

    National Historic Site Pennsylvania

Nonnative Species

One need not look far to find a non-native plant species within the park. Many of these plants were used as ornamentals or for erosion prevention and bank stabilization. Now they are invading our native woodlands and fields, and in some cases have reached problematic stages.

Efforts are currently underway to maintain control of the most threatening exotic species in areas of the park where the infestations can be managed. The park presently has an integrated pest management program for giant and Japanese knotweed, Japanese barberry, Japanese and exotic bush honeysuckles, multiflora rose and Asiatic bittersweet.

Did You Know?

East Entrance Staple Bend Tunnel

In 1824 an all-water route through the Allegheny Mountains was proposed. A 4 mile tunnel "like a well dug horizontially" would be needed, along with ventilation shafts and support features. A portage over the mountains was built instead.