Pennsylvania Railroad, Delaware River Bridge, Spanning Delaware River,...
Significance: The crossing is a critical link in the railroad route from Philadelphia to New York, and has hosted a series of bridges dating back to 1806. The current bridge is one of the Pennsylvania Railroad'... 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
Pennsylvania Railroad, Mount Union Bridge, Spanning Juniata River, nor...
Significance: The bridge is significant as an example of the Pennsylvania Railroad's prolific stone arch bridge construction during the early 20th century. In addition, it elegantly breaks classical aesthetic r... More
Little Conewago Creek Bridge, Spanning South Branch of Conewago Creek ...
Significance: It was constructed on the site of the first publicly funded bridge in Adams County (then part of York County). A series of structures at this location have aided commercial development, giving acc... More
Philadelphia, Baltimore & Washington Railroad, Bridge No. 3, Spanning ...
Significance: This arch span over Island Road is significant for its architectural detail, a whimsical interpretation of classical proportions in reinforced concrete. Its most remarkable features are balustrade... More
Philadelphia, Baltimore & Washington Railroad, Bridge No. 3, Spanning ...
Significance: This arch span over Island Road is significant for its architectural detail, a whimsical interpretation of classical proportions in reinforced concrete. Its most remarkable features are balustrade... More
Pennsylvania Railroad, Manayunk Bridge, Spanning Schuylkill Expressway...
Significance: The bridge's nine open-spandrel reinforced concrete arches follow an unusual reverse curvature, which earns it the nickname "S-bridge." Towering over the town of Manayunk and the Schuylkill Expres... More
Easton & Northern Railroad, Lehigh River Bridge, Spanning Lehigh River...
Significance: This structures is significant for its highly complex geometry, with skew trusses carrying trucks on a reverse curve. It possesses a remarkable degree of integrity for a 19th century steel truss b... More
Easton & Northern Railroad, Lehigh River Bridge, Spanning Lehigh River...
Significance: This structures is significant for its highly complex geometry, with skew trusses carrying trucks on a reverse curve. It possesses a remarkable degree of integrity for a 19th century steel truss b... More
Soldiers' & Sailors' Memorial Bridge, Spanning Paxton Creek & Cameron ...
Significance: The bridge is an excellent example of a monumental bridge. Its militaristic decorative elements indicate its purpose as a memorial to all Pennsylvanians who have served in the armed forces. The ca... More
Soldiers' & Sailors' Memorial Bridge, Spanning Paxton Creek & Cameron ...
Significance: The bridge is an excellent example of a monumental bridge. Its militaristic decorative elements indicate its purpose as a memorial to all Pennsylvanians who have served in the armed forces. The ca... More
Pithole Stone Arch Bridge, Spanning Pithole Creek at Eagle Rock Road (...
Significance: It is significant as a late 19th century example of a rural masonry bridge constructed at a time when most of its counterparts were built in the more common metal truss types. Although considered ... More
Philadelphia & Reading Railroad, Delaware River Bridge, Spanning Delaw...
Significance: The bridge, an early, large-scale reinforced concrete structure, is a significant example of its type because of several unusual details. Its closed-spandrel arches are rife with expansion joints ... More
Washington Crossing Bridge, Spanning Allegheny River at Fortieth Stree...
See also HABS PA-1179 for additional documentation. Includes drawings. Significance: The bridge is an outstanding example of a long-span metal deck arch bridge. Its unique architectural details, forged in a suc... More
Washington Crossing Bridge, Spanning Allegheny River at Fortieth Stree...
See also HABS PA-1179 for additional documentation. Includes drawings. Significance: The bridge is an outstanding example of a long-span metal deck arch bridge. Its unique architectural details, forged in a suc... More
Philadelphia & Reading Railroad, Peacock's Lock Viaduct, Spanning Schu...
Significance: The Peacock's Lock Viaduct, named after a nearby lock on the Schuylkill Division Canal, may be the only masonry arch bridge in the U.S. with pierced spandrels. The circular openings between arche... More
Falls Bridge, Spanning Schuylkill River, connecting East & West River ...
Significance: The Falls Bridge is a unique and well-preserved example of the Petit through truss design, capable of carrying a roadway on both its upper and lower chords. The upper deck remains incomplete, but... More
Falls Bridge, Spanning Schuylkill River, connecting East & West River ...
Significance: The Falls Bridge is a unique and well-preserved example of the Petit through truss design, capable of carrying a roadway on both its upper and lower chords. The upper deck remains incomplete, but... More
George Westinghouse Bridge, Spanning Turtle Creek at Lincoln Highway (...
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Pleasantville Covered Bridge, Spanning Little Manatawny Creek at Cover...
Significance: One of five remaining covered wooden bridges in Berks County, the bridge is a contributing resource in the Oley Township Historic District. It is distinctive for its two-phase construction: an arc... More
Philadelphia & Reading Railroad, Bridge at West Falls, Spanning Schuyl...
See also HAER PA-39 for related documentation. Includes photographs & written data. Significance: The Philadelphia & Reading Railroad's second bridge at West Falls complements the adjacent Falls Bridge (1854) i... More
Philadelphia & Reading Railroad, Bridge at West Falls, Spanning Schuyl...
See also HAER PA-39 for related documentation. Includes photographs & written data. Significance: The Philadelphia & Reading Railroad's second bridge at West Falls complements the adjacent Falls Bridge (1854) i... More
Central Railroad of New Jersey, Lehigh River Bridge at Easton, Spannin...
Significance: This skewed crossing of the Lehigh River, with one span over the Third Street Bridge, is significant as a highly visible local landmark. When the structure partially collapsed during a 1902 flood,... More
Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...
Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More
Kralltown Road Bridge, Spanning Bermudian Creek at Kralltown Road (Sta...
Significance: It was built in 1884 by the Wrought Iron Bridge Company, a leading 19th century bridge fabricator and builder. It is a double-intersection Pratt through truss, a representative truss type used for... More
Gay Street Bridge, Spanning French Creek at Gay Street (State Route 11...
Significance: After its construction in 1926, the 12-span, reinforced concrete bridge was the longest such structure in Chester County. It is significant for the variety of span types and construction methods u... More
Pennsylvania Railroad, Pickering Creek Trestle, Spanning Pickering Cre...
Significance: The trestle is significant as a high trestle with both horizontal and vertical curvature. Unprocessed Field note material exists for this structure: N596 Survey number: HAER PA-521 Building/str... More
Kellams Bridge, Spanning Delaware River at Stalker-Kellams Road (State...
Significance: It is one of the few short-span wire-cable suspension bridges remaining in Pennsylvania. It was altered extensively in 1936. Unprocessed Field note material exists for this structure: N446 Surve... More
Old Brownsville Bridge, Spanning Monongahela River & Water Street at S...
Significance: The Pennsylvania truss bridge spans the Monongahela River between Brownsville and West Brownsville. The bridge is heavily constructed of built-up members and eye-bars, and is a significant landmar... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Pennsylvania Railroad, Brandywine Valley Viaduct, Spanning Brandywine ...
Significance: It is notable for its height, length, and complex geometry, which includes both horizontal and vertical curvature. It is also significant in association with the Pennsylvania Railroad's Philadelph... More
South Eighth Street Viaduct, Spanning Little Lehigh Creek at Eighth St...
Significance: It is one of the earliest surviving example of "monumental" reinforced concrete construction. Initially planned in 1900 as a steel truss structure over the Little Lehigh Creek, the final result, b... More
Lower Bridge at English Center, Spanning Little Pine Creek at State Ro...
Significance: It is the only remaining bridge of two completed in 1891 to provide access to this once-important regional logging and tanning center. One of few surviving short-span roadway suspension bridges in... More
Philadelphia & Reading Railroad, Wissahickon Creek Viaduct, Spanning W...
Significance: The Wissahickon Creek Viaduct marks the beginning of a resurgence in major stone arch bridge construction on American railroads after the panic of 1873. Unprocessed Field note material exists for... More
Philadelphia & Reading Railroad, Wissahickon Creek Viaduct, Spanning W...
Significance: The Wissahickon Creek Viaduct marks the beginning of a resurgence in major stone arch bridge construction on American railroads after the panic of 1873. Unprocessed Field note material exists for... More
Philadelphia & Reading Railroad, Wissahickon Creek Viaduct, Spanning W...
Significance: The Wissahickon Creek Viaduct marks the beginning of a resurgence in major stone arch bridge construction on American railroads after the panic of 1873. Unprocessed Field note material exists for... More
Philadelphia & Reading Railroad, Wissahickon Creek Viaduct, Spanning W...
Significance: The Wissahickon Creek Viaduct marks the beginning of a resurgence in major stone arch bridge construction on American railroads after the panic of 1873. Unprocessed Field note material exists for... More
Franklin Street Bridge, Spanning Oil Creek at Franklin Street (State R...
Significance: Fires and floods during the early days of the oil industry promoted the frequent replacement of the bridge. The most recent, a tied plate-girder through arch designed by Crawford County Engineer K... More
Charleroi-Monessen Bridge, Spanning Monongahela River at State Route 2...
Significance: It is significant as a rare surviving example of a long, multiple-span metal truss bridge. Built as a toll bridge to carry vehicular, pedestrian, and trolley traffic across the Monongahela River, ... More
Larimer Avenue Bridge, Spanning Washington Boulevard at Larimer Avenue...
Significance: At the time of its construction, the bridge was the world's longest reinforced concrete arch span. The bridge was part of a large public works program in Pittsburgh responding to several reports c... More
Inclined Plane Bridge, Spanning Stonycreek River at State Route 3022 S...
Significance: This single-span, pin-connected Pennsylvania through truss bridge was constructed across the Stonycreek River in conjunction with an inclined plane railway shortly after the Johnstown Flood of 189... More
Lehigh Valley Railroad, Delaware River Bridge, Spanning Delaware River...
Significance: This structure occupies the piers of the first railroad bridge to cross the Delaware River at Easton. It is also notable for its fish-belly deck trusses, an unusual variant of the Pratt design. U... More
Lehigh Valley Railroad, Delaware River Bridge, Spanning Delaware River...
Significance: This structure occupies the piers of the first railroad bridge to cross the Delaware River at Easton. It is also notable for its fish-belly deck trusses, an unusual variant of the Pratt design. U... More
University Avenue Bridge, Spanning Schuylkill River at University Aven...
Significance: The bridge is significant for its association with noted Philadelphia architect Paul Phillipe Cret, who designed the bridge in collaboration with city engineers. Its exterior treatment reflects Cr... More
Nicholson Township Lenticular Bridge, Spanning Tunkhannock Creek at St...
Significance: It is a well-preserved example of a truss fabricated by the Corrugated Metal Company. Of special interest is how the company fabricated the pin connections at the end-posts and on the top chord...... More
Ohio Connecting Railway, Brunot's Island Bridge, Spanning Ohio River a...
Significance: The bridge is significant for its complexity, carrying rail traffic in four directions across the Ohio River on a system of high viaduct spans and through trusses. Innovative methods were used to ... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... 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
Liberty Bridge, Spanning Monongahela River, East Carson Street & Secon...
Significance: This was the longest and most expensive bridge built in Allegheny County when it was completed in 1928. The bridge links Pittsburgh's downtown area with the Liberty Tunnels, built through Mt. Wash... More
Northampton Street Bridge, Spanning Delaware River at Northampton Stre...
Significance: The bridge is one of a few extant eye-bar cantilever bridges in the U.S. Its long central span, supported between two cantilever arms, is carefully disguised by superfluous members so as to appear... More
Northampton Street Bridge, Spanning Delaware River at Northampton Stre...
Significance: The bridge is one of a few extant eye-bar cantilever bridges in the U.S. Its long central span, supported between two cantilever arms, is carefully disguised by superfluous members so as to appear... More
Phoenix Iron Company, Rolling Mill, North of French Creek, west of Fai...
Survey number: HAER PA-493-C Public domain photograph - historical image of Pennsylvania, United States, free to use, no copyright restrictions image - Picryl description
Pennsylvania Railroad, Allegheny Tunnel, Beneath Allegheny Mountain, e...
Significance: It is an example of a mid-19th century railroad tunnel featuring ashlar masonry portals and a brick arch lining. Upon completion it was the longest railroad tunnel in America, allowing railcars to... More
Waterville Bridge, Spanning Swatara Creek at Appalachian Trail (moved ...
Significance: It is an example of a lenticular truss, so named because of the lens-like shape of its curved upper and lower chords. It is representative of the Berlin Iron Bridge Company's trademark bridge type... More
Pennsylvania & New Jersey Railroad, Delaware River Bridge, Spanning De...
Significance: Because of its location on the lower Delaware River, the bridge has a collection of extremely long and heavy spans. These include the world's heaviest center-bearing swing span, completed in 1896,... More
Pennsylvania & New Jersey Railroad, Delaware River Bridge, Spanning De...
Significance: Because of its location on the lower Delaware River, the bridge has a collection of extremely long and heavy spans. These include the world's heaviest center-bearing swing span, completed in 1896,... More
Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...
Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Erie Railway, Delaware Division, Bridge 110.54, Spanning Lackawaxen Ri...
Significance: The former Erie Railroad bridge over the Lackawaxen River is significant as a late nineteenth-century truss structure remaining in main-line service, and as the work of a major bridge-building com... More
Erie Railway, Delaware Division, Bridge 110.54, Spanning Lackawaxen Ri...
Significance: The former Erie Railroad bridge over the Lackawaxen River is significant as a late nineteenth-century truss structure remaining in main-line service, and as the work of a major bridge-building com... More
Phoenix Iron Company, Foundry Building, Main Street at Mill Street, Ph...
Significance: Iron work began on the banks of French Creek in 1783 and continued, weathering massive changes in ferrous metalworking techniques, for 200 years. The foundry produced castings ancillary to the Pho... More
Phoenix Iron Company, Foundry Building, Main Street at Mill Street, Ph...
Significance: Iron work began on the banks of French Creek in 1783 and continued, weathering massive changes in ferrous metalworking techniques, for 200 years. The foundry produced castings ancillary to the Pho... More
Frankford Avenue Bridge over Poquessing Creek, Spanning Poquessing Cre...
See also HAER PA-478 for related documentation. Includes written data. Significance: This single-span, closed-spandrel arch bridge is an early example of a concrete bridge with supporting members. The bridge's ... 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
Market Street Bridge, Spanning East channel of Susquehanna River at Ma...
Significance: The river crossing where the bridge now stands had historically been the western gateway into Harrisburg. For over a century, spans here were operated by the Harrisburg Bridge Company, including t... More
Market Street Bridge, Spanning East channel of Susquehanna River at Ma...
Significance: The river crossing where the bridge now stands had historically been the western gateway into Harrisburg. For over a century, spans here were operated by the Harrisburg Bridge Company, including t... More
Pennsylvania Railroad, Mount Union Bridge, Spanning Juniata River, nor...
Significance: The bridge is significant as an example of the Pennsylvania Railroad's prolific stone arch bridge construction during the early 20th century. In addition, it elegantly breaks classical aesthetic r... More
Upper Bridge at Slate Run, Spanning Pine Creek at State Route 414, Sla...
See also HAER PA-478 for related documentation. Includes written data. Significance: The bridge is a lattice truss, and unusual truss type that was built in the U.S. from about 1857 to the 1890s. Riveting all t... More
Allegheny Portage Railroad, Lilly Culvert, Spanning Burgoon Run at Sta...
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
Pennsylvania Railroad, Manayunk Bridge, Spanning Schuylkill Expressway...
Significance: The bridge's nine open-spandrel reinforced concrete arches follow an unusual reverse curvature, which earns it the nickname "S-bridge." Towering over the town of Manayunk and the Schuylkill Expres... More
Pennsylvania Railroad, Manayunk Bridge, Spanning Schuylkill Expressway...
Significance: The bridge's nine open-spandrel reinforced concrete arches follow an unusual reverse curvature, which earns it the nickname "S-bridge." Towering over the town of Manayunk and the Schuylkill Expres... More
Pond Creek Bridge, Spanning Pond Creek at Bear Lake Road (State Route ...
Significance: This structure is an excellent example of a WPA-sponsored project because of its well-preserved condition and undisturbed setting, where it spans Pond Creek on a rural road just outside of Lackawa... More
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Davis Avenue Bridge, Spanning Woods Run Avenue at Davis Avenue, Pittsb...
Significance: The bridge is a cantilevered structure constructed for transportation, social, and municipal purposes. Constructed before Allegheny City was consolidated into greater Pittsburgh, the bridge repres... More
Easton & Northern Railroad, Lehigh River Bridge, Spanning Lehigh River...
Significance: This structures is significant for its highly complex geometry, with skew trusses carrying trucks on a reverse curve. It possesses a remarkable degree of integrity for a 19th century steel truss b... More
McKee's Rocks Bridge, Spanning Ohio River at Chartiers Avenue (State R...
Significance: The bridge is an outstanding example of a long-span metal through arch bridge constructed by Allegheny County as part of an intensive bridge-building campaign during the late 1920s and early 1930s... More
Philadelphia & Reading Railroad, Peacock's Lock Viaduct, Spanning Schu...
Significance: The Peacock's Lock Viaduct, named after a nearby lock on the Schuylkill Division Canal, may be the only masonry arch bridge in the U.S. with pierced spandrels. The circular openings between arche... More
Philadelphia & Reading Railroad, Peacock's Lock Viaduct, Spanning Schu...
Significance: The Peacock's Lock Viaduct, named after a nearby lock on the Schuylkill Division Canal, may be the only masonry arch bridge in the U.S. with pierced spandrels. The circular openings between arche... More
George Westinghouse Bridge, Spanning Turtle Creek at Lincoln Highway (...
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e... More
George Westinghouse Bridge, Spanning Turtle Creek at Lincoln Highway (...
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Pleasantville Covered Bridge, Spanning Little Manatawny Creek at Cover...
Significance: One of five remaining covered wooden bridges in Berks County, the bridge is a contributing resource in the Oley Township Historic District. It is distinctive for its two-phase construction: an arc... More
Pleasantville Covered Bridge, Spanning Little Manatawny Creek at Cover...
Significance: One of five remaining covered wooden bridges in Berks County, the bridge is a contributing resource in the Oley Township Historic District. It is distinctive for its two-phase construction: an arc... More
Pleasantville Covered Bridge, Spanning Little Manatawny Creek at Cover...
Significance: One of five remaining covered wooden bridges in Berks County, the bridge is a contributing resource in the Oley Township Historic District. It is distinctive for its two-phase construction: an arc... More
Philadelphia & Reading Railroad, Bridge at West Falls, Spanning Schuyl...
See also HAER PA-39 for related documentation. Includes photographs & written data. Significance: The Philadelphia & Reading Railroad's second bridge at West Falls complements the adjacent Falls Bridge (1854) i... More
Phoenix Iron Company, French Creek Bridge, Spanning French Creek betwe...
Unprocessed Field note material exists for this structure: N595 Survey number: HAER PA-493-B
Connecting Railway, Schuylkill River Bridge, Spanning Schuylkill River...
See also HABS PA-6213 for additional documentation. Includes photographs. See also HAER PA-71 for related documentation. Includes photographs. Significance: Completed in 1867, the Connecting Railway's Schuylkil... More
Pennsylvania Railroad, Granville Bridge, Spanning Juniata River, 1.25 ...
Significance: The bridge is significant as a well-preserved example of a medium-length stone arch bridge, representing the Pennsylvania Railroad's monumental capitol investment and desire for "permanent" struct... More
Gay Street Bridge, Spanning French Creek at Gay Street (State Route 11...
Significance: After its construction in 1926, the 12-span, reinforced concrete bridge was the longest such structure in Chester County. It is significant for the variety of span types and construction methods u... More
Phoenix Iron Company, Girder Shop No. 6, North of French Creek, west o...
Survey number: HAER PA-493-D Public domain photograph - historical image of Pennsylvania, United States, free to use, no copyright restrictions image - Picryl description
Philadelphia & Reading Railroad, Mill Creek Bridge, Spanning Mill Cree...
Significance: This structure is significant as a well-preserved example among dozens of stone arch bridges built along the Philadelphia & Reading Railroad during the mid-19th century, and one of few with a curv... More
Old Brownsville Bridge, Spanning Monongahela River & Water Street at S...
Significance: The Pennsylvania truss bridge spans the Monongahela River between Brownsville and West Brownsville. The bridge is heavily constructed of built-up members and eye-bars, and is a significant landmar... More
Campbell's Bridge, Spanning Unami Creek at Allentown Road (State Route...
See also HAER PA-478 for related documentation. Includes written data. Significance: The bridge is part of a once larger body of early short-span reinforced concrete bridges in Bucks County. It is the oldest op... More
South Eighth Street Viaduct, Spanning Little Lehigh Creek at Eighth St...
Significance: It is one of the earliest surviving example of "monumental" reinforced concrete construction. Initially planned in 1900 as a steel truss structure over the Little Lehigh Creek, the final result, b... More