The Allegheny Portage Railroad was the first railroad constructed through the Allegheny Mountains in central Pennsylvania. It operated from 1834 to 1854 as the first transportation infrastructure through the gaps of the Allegheny that connected the midwest to the eastern seaboard across the barrier range of the Allegheny Front. Approximately 36 miles (58 km) long overall, both ends connected to the Pennsylvania Canal, and the system was primarily used as a portage railway, hauling river boats and barges over the divide between the Ohio and the Susquehanna Rivers. Today, the remains of the railroad are preserved within the Allegheny Portage Railroad National Historic Site operated by the National Park Service.
The Columbia–Wrightsville Bridge, officially the Veterans Memorial Bridge, spans the Susquehanna River between Columbia and Wrightsville, Pennsylvania, and carries Pennsylvania Route 462 and BicyclePA Route S. Built originally as the Lancaster-York Intercounty Bridge, construction began in 1929, and the bridge opened September 30, 1930. On November 11, 1980, it was officially dedicated as Veterans Memorial Bridge, though it is still referenced locally as the Columbia–Wrightsville Bridge.
The West End Bridge is a steel tied-arch bridge over the Ohio River in Pittsburgh, Pennsylvania, approximately 1 mile (1.6 km) below the confluence of the Allegheny and Monongahela Rivers. It connects the West End to the Chateau neighborhood on the North Side of Pittsburgh.
The Wills Creek Bollman Bridge originally served the Baltimore and Ohio Railroad's Pittsburgh Division main line.
The McKees Rocks Bridge is a steel trussed through arch bridge which carries the Blue Belt, Pittsburgh's innermost beltline, across the Ohio River at Brighton Heights and McKees Rocks, Pennsylvania, west of the city.
Starrucca Viaduct is a stone arch bridge that spans Starrucca Creek near Lanesboro, Pennsylvania, in the United States. Completed in 1848 at a cost of $320,000, it was at the time the world's largest stone railway viaduct and was thought to be the most expensive railway bridge as well. Still in use, the viaduct is listed on the National Register of Historic Places and is designated as a National Historic Civil Engineering Landmark.
Tunkhannock Creek Viaduct is a concrete deck arch bridge on the Nicholson Cutoff rail segment of the Norfolk Southern Railway Sunbury Line that spans Tunkhannock Creek in Nicholson, Pennsylvania. Measuring 2,375 feet (724 m) long and towering 240 feet (73.15 m) when measured from the creek bed, it was the largest concrete structure in the world when completed in 1915 and still merited "the title of largest concrete bridge in America, if not the world" 50 years later.
The original Walnut Lane Memorial Bridge was a prestressed concrete girder bridge in Philadelphia, Pennsylvania, designed by Belgian Engineer Gustave Magnel and built by the City of Philadelphia. Completed and fully opened to traffic in 1951, this three-span bridge carried Walnut Lane over Lincoln Drive and Monoshone Creek. It was the first major prestressed concrete beam bridge designed and built in the United States when completed.
The Mulberry Street Bridge is an American concrete arch bridge that spans Cameron Street and Paxton Creek in Harrisburg, Pennsylvania.
The Albertus L. Meyers Bridge, also known as the Eighth Street Bridge, the South Eighth Street Viaduct, and unsigned as SR 2055, is a reinforced concrete open-spandrel arch bridge located in Allentown, Pennsylvania. The bridge is "one of the earliest surviving examples of monumental, reinforced concrete construction," according to the American Society of Civil Engineers.
Turtle Creek is a 21.1-mile-long (34.0 km) tributary of the Monongahela River that is located in Allegheny and Westmoreland counties in the U.S. state of Pennsylvania. Situated at its juncture with the Monongahela is Braddock, Pennsylvania, where the Battle of the Monongahela was fought in 1755.
The Panther Hollow Bridge is an American steel, three-hinged, deck arch bridge that carries Panther Hollow Road over Panther Hollow in Schenley Park in Pittsburgh, Pennsylvania.
The Hares Hill Road Bridge is a single-span, wrought iron, bowstring-shaped lattice girder bridge. It was built in 1869 by Moseley Iron Bridge and Roof Company and is the only known surviving example of this kind. The bridge spans French Creek, a Pennsylvania Scenic River.
The Walnut Lane Bridge is a concrete arch bridge located in Northwest Philadelphia that connects the Germantown and Roxborough neighborhoods across the Wissahickon Creek in Fairmount Park. While drivers may cross the bridge too quickly to notice, the view from underneath the bridge has inspired many artists and writers, such as Christopher Morley. The design was copied from Pont Adolphe in Luxembourg.
The Sonestown Covered Bridge is a covered bridge over Muncy Creek in Davidson Township, Sullivan County, Pennsylvania built around 1850. It is 110 ft (34 m) long and was placed on the National Register of Historic Places (NRHP) in 1980. It is named for the nearby unincorporated village of Sonestown in Davidson Township, and is also known as the Davidson Covered Bridge. It was built to provide access to a grist mill which operated until the early 20th century.
The Wissahickon Memorial Bridge, originally called and still also known as the Henry Avenue Bridge, is a stone and concrete bridge that carries Henry Avenue over Wissahickon Creek and Lincoln Drive in Fairmount Park in Philadelphia, Pennsylvania.
The Perkiomen Bridge, originally built 1798-99 and widened in 1928, is one of the oldest stone arch bridges in the United States still in use. It crosses Perkiomen Creek near Collegeville, Pennsylvania. The bridge's six semi-circular arches cover a total of over 300 feet (91 m). The longest arch spans 76 feet (23 m). Its decorative piers and belt courses are unusual for a bridge this old. A lottery financed $20,000 of the original construction. The bridge carried the main road from Philadelphia to Reading, known at various times as the Manatawny Pike, Germantown Pike, the Philadelphia-Reading Pike, and US 422. Since the construction of the US 422 bypass, the road has been known as Ridge Pike or Old US 422.
Maclay's Twin Bridge (West) is a historic multi-span stone arch bridge spanning a tributary of Conodoguinet Creek between Lurgan Township and Southampton Township in Franklin County, Pennsylvania. It is a 177-foot-long (54 m) bridge with three spans, the longest of which measures 31 feet (9.4 m) long. It was constructed in 1827 and is a twin of McClay's Twin Bridge (East).
Bridge in Metal Township, also known as Keggereis Ford Bridge, is a historic multi-span concrete arch bridge located at Metal Township in Franklin County, Pennsylvania. It is a 105-foot-long (32 m) bridge with three spans, the longest of which measures 45 feet (14 m) long. It was constructed in 1907. It carries Stone Bridge Road over the West Branch Conococheague Creek.
The Marble Bridge, formally known as the Fletcher D. Proctor Memorial Bridge, carries Main Street across Otter Creek in the center of Proctor, Vermont. Built in 1915, and widened in 1935-36, it is a well-preserved example of early concrete bridge construction, and is decoratively faced in local marble. The bridge was listed on the National Register of Historic Places in 1991.
US 30 (Lincoln Highway) at Turtle Creek, North Versailles Township, East Pittsburgh, Pennsylvania 
