Significance: The Staple Bend Tunnel is proclaimed to be the first railroad tunnel in the United States. Survey number: HAER PA-240 Building/structure dates: ca. 1830 Initial Construction National Register o More
Significance: The Staple Bend Tunnel is proclaimed to be the first railroad tunnel in the United States. Survey number: HAER PA-240 Building/structure dates: ca. 1830 Initial Construction National Register o More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More
Significance: It is significant as an outstanding example of early 19th century masonry arch construction, and for its association with the Allgeheny Portage Railroad, which the bridge originally carried across More