Stone Abutments

Significance: James Kinkead, a local bridge builder and stage line operator, built Clarysville Bridge for $1,100 in 1812. Kinkead held one of the first construction contracts awarded by the federal government More

Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.

The original finding aid described this photograph as: Original Caption: A scenic view of the Roebling Pedestrian Bridge at Lumberville/Raven Rock captures the beauty of the Delaware River and the Delaware Riv More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: The limestone/marble deposits in the Pike Creek Valley of New Castle County are the largest in the State of Delaware. During the first third of the 19th century they became the center of an exten More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: Of the four Pennsylvania truss bridges that were identified in Cultural Resources in Wisconsin, the state's manual for historic properties, the Lynch Bridge is one of only two that remain today. More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t More

Survey number: HAER DE-12-B Building/structure dates: 1903-1905 Initial Construction

Survey number: HAER DE-12-B Building/structure dates: 1903-1905 Initial Construction

Survey number: HAER DE-12-B Building/structure dates: 1903-1905 Initial Construction

Significance: Built of native sandstone and ashlar masonry, and designed to complement its natural surroundings, this bridge is a superb example of "National Park Service-Rustic" stone bridge engineering. It i More

Significance: Built of native sandstone and ashlar masonry, and designed to complement its natural surroundings, this bridge is a superb example of "National Park Service-Rustic" stone bridge engineering. It i More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive More

Significance: The Blood Road Bridge is one of the few remaining pre-1900 bridges fabricated and erected by the Havana Bridge Works, of Havana, New York. The W.H. Shepard & Sons bridge at Woodworth Road, also d More

Significance: The Blood Road Bridge is one of the few remaining pre-1900 bridges fabricated and erected by the Havana Bridge Works, of Havana, New York. The W.H. Shepard & Sons bridge at Woodworth Road, also d More

Significance: The Blood Road Bridge is one of the few remaining pre-1900 bridges fabricated and erected by the Havana Bridge Works, of Havana, New York. The W.H. Shepard & Sons bridge at Woodworth Road, also d More

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Survey number: HAER DE-12-C Building/structure dates: 1902-1908 Initial Construction

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

Report includes engineering analysis of Burr arch truss. Significance: For almost two centuries, from 1735 until 1926, this site was used for water-powered industries. Erected in 1860 by local bridge builder J More

The B&O Railroad was authorized to abandon the bridge and the portion of the Hagerstown Branch on which the bridge was located in 1978. Significance: This bridge is one of the longest on the Baltimore and Ohio More

The B&O Railroad was authorized to abandon the bridge and the portion of the Hagerstown Branch on which the bridge was located in 1978. Significance: This bridge is one of the longest on the Baltimore and Ohio More

The B&O Railroad was authorized to abandon the bridge and the portion of the Hagerstown Branch on which the bridge was located in 1978. Significance: This bridge is one of the longest on the Baltimore and Ohio More

The B&O Railroad was authorized to abandon the bridge and the portion of the Hagerstown Branch on which the bridge was located in 1978. Significance: This bridge is one of the longest on the Baltimore and Ohio More

The B&O Railroad was authorized to abandon the bridge and the portion of the Hagerstown Branch on which the bridge was located in 1978. Significance: This bridge is one of the longest on the Baltimore and Ohio More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Blackwell Bridge, a single-span, pin-connected Pratt through truss, is the largest remaining steel truss bridge in Elbert County. It was fabricated and erected by the Austin Brothers Bridge C More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More

Significance: The Lea Bridge is an early Pratt pony truss bridge and contains two unusual design features: "beaded T" angles and patented end chord connections. Also, it is only one of two bridges remaining i More