Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Columbia-Wrightsville Bridge, Spanning Susquehanna River at Lincoln Hi...
Significance: When it was dedicated on Armistice Day, 1930, the bridge was the longest multiple-arch concrete bridge in the world. 28 three-ribbed open-spandrel reinforced concrete arches, carry the bridge acro... More
Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More
Maclay's Mill Twin Bridge (East & West), Spanning Conodoguinet Creek a...
Significance: The bridges are outstanding examples of surviving stone arch bridges constructed by a 19th century designer craftsperson. Before the appearance of professional engineers and architects during the ... More
Monongahela Navigation Company Lock & Dam No. 7, River Mile No. 82.5, ...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individ... More