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strengthening

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Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek, Hopewell, Bedford County, PA

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek,...

Significance: This steel-constructed Pratt through truss is a typical metal truss span of the late nineteenth century. It is, however, one of the region's few surviving Keystone Bridge Company spans built for ... More

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek, Hopewell, Bedford County, PA

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek,...

Significance: This steel-constructed Pratt through truss is a typical metal truss span of the late nineteenth century. It is, however, one of the region's few surviving Keystone Bridge Company spans built for ... More

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek, Hopewell, Bedford County, PA

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek,...

Significance: This steel-constructed Pratt through truss is a typical metal truss span of the late nineteenth century. It is, however, one of the region's few surviving Keystone Bridge Company spans built for ... More

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek, Hopewell, Bedford County, PA

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek,...

Significance: This steel-constructed Pratt through truss is a typical metal truss span of the late nineteenth century. It is, however, one of the region's few surviving Keystone Bridge Company spans built for ... More

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek, Hopewell, Bedford County, PA

Bedford County Bridge No. 4, Township Route 655 spanning Yellow Creek,...

Significance: This steel-constructed Pratt through truss is a typical metal truss span of the late nineteenth century. It is, however, one of the region's few surviving Keystone Bridge Company spans built for ... More

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Street at Woodward Street, Reading, Berks County, PA

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Str...

Unprocessed Field note material exists for this structure: N640 Survey number: HAER PA-117

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Street at Woodward Street, Reading, Berks County, PA

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Str...

Unprocessed Field note material exists for this structure: N640 Survey number: HAER PA-117

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Street at Woodward Street, Reading, Berks County, PA

Philadelphia & Reading Railroad, Reading Depot Bridge, North Sixth Str...

Unprocessed Field note material exists for this structure: N640 Survey number: HAER PA-117

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Avenue, Yardley, Bucks County, PA

Bucks County Bridge No. 313, Spanning Delaware Canal at Letchworth Ave...

Significance: Bucks County Bridge 313 is a single span Pratt pony truss crossing over the Delaware Canal. The bridge is temporally associated with the Delaware Canal, a resource currently listed on the Nationa... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning Elk Creek, south of Elk Park Road, Lake City, Erie County, PA

New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...

Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga River, South of City Water Works, Lancaster, Lancaster County, PA

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga Riv...

Significance: It is unusual as a two-track bridge on a four-track line, and more so because of the projecting voussoirs on its south side, which would key in with a yet-unbuilt extension. Unprocessed Field not... More

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga River, South of City Water Works, Lancaster, Lancaster County, PA

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga Riv...

Significance: It is unusual as a two-track bridge on a four-track line, and more so because of the projecting voussoirs on its south side, which would key in with a yet-unbuilt extension. Unprocessed Field not... More

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga River, South of City Water Works, Lancaster, Lancaster County, PA

Pennsylvania Railroad, Conestoga Creek Viaduct, Spanning Conestoga Riv...

Significance: It is unusual as a two-track bridge on a four-track line, and more so because of the projecting voussoirs on its south side, which would key in with a yet-unbuilt extension. Unprocessed Field not... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's Mill Road (Township Route 415), Ellwood City, Lawrence County, PA

McConnell's Mill Bridge, Spanning Slippery Rock Creek at McConnell's M...

Significance: One of 4 extant Howe-truss covered bridges in Pennsylvania. It is the longest of these that has not been completely rebuilt. Erected originally to transport cargo from a grist mill, the bridge sti... More