A covered bridge is a timber-truss bridge with a roof, decking, and siding, which in most covered bridges create an almost complete enclosure. The purpose of the covering is to protect the wooden structural members from the weather. Uncovered wooden bridges typically have a lifespan of only 20 years because of the effects of rain and sun, but a covered bridge can last over 100 years. In the United States, only about 1 in 10 survived the 20th century. The relatively small number of surviving bridges is due to deliberate replacement, neglect, and the high cost of restoration.
Port Deposit is a town in Cecil County, Maryland, United States. It is located on the east bank of the Susquehanna River near its discharge into the Chesapeake Bay. The population was 653 at the 2010 census.
The Philadelphia, Wilmington and Baltimore Railroad (PW&B) was an American railroad that operated independently from 1836 to 1881. Headquartered in Philadelphia, it was greatly enlarged in 1838 by the merger of four state-chartered railroads in three Mid-Atlantic states to create a single line between Philadelphia and Baltimore.
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 Coraopolis Bridge[1] is a girder bridge over the back channel of the Ohio River connecting Grand Avenue on Neville Island to Ferree Street in Coraopolis, Pennsylvania. It opened in 1995 to replace a structure of historic significance. The original Pratt/Bowstring/Pennsylvania[2] through truss spans, designed by Theodore Cooper, were formerly the (third) Sixth Street Bridge, spanning the Allegheny River, in downtown Pittsburgh, and were built in 1892 by the Union Bridge Company. They were floated downstream by the Foundation Company in 1927 rather than being demolished when the bridge was removed to enable construction of the present (fourth) Three Sisters (Pittsburgh) Sixth Street Self-anchored suspension bridge. However, by the late 1980s, the old bridge could no longer support traffic volumes and was replaced by a newer structure.
The CSX Susquehanna River Bridge is a railroad bridge that carries CSX's Philadelphia Subdivision across the Susquehanna River between Havre de Grace and Perryville, Maryland, via Garrett Island. It was built in 1907–1910 by the Baltimore and Ohio Railroad (B&O) on the same alignment as an 1886 B&O bridge. Like its predecessor, it was the longest continuous bridge on the B&O system.
The Pennsylvania Railroad Bridge once carried the York Branch of the Pennsylvania Railroad across the Susquehanna River between Columbia and Wrightsville, Pennsylvania and is therefore considered a Columbia-Wrightsville Bridge. It and its predecessors were a vital commercial and passenger linkage between Philadelphia and Baltimore for over 100 years.
The Philadelphia & Reading Railroad Bridge carries Norfolk Southern rail lines across the Susquehanna River between Lemoyne, Pennsylvania and Harrisburg, Pennsylvania. Some of its concrete piers encase stone masonry piers from an earlier truss bridge on this site, completed in 1891 by the Philadelphia, Harrisburg and Pittsburgh Railroad, which was then acquired by the Philadelphia and Reading Railroad to connect its Harrisburg and Lurgan lines. The current structure was constructed from 1920 to 1924 by replacing the trusses with concrete arches one track at a time. The bridge has fifty-one concrete arches, three more than the nearby Rockville Bridge.
The Cumberland Valley Railroad Bridge is a currently unused railroad bridge.
The Clarks Ferry Bridge is a plate girder bridge that carries U.S. Routes 22 and 322 across the Susquehanna River near Duncannon, Pennsylvania, about 20 miles north of Harrisburg, Pennsylvania. It is a 4 lane expressway standard bridge. The bridge also provides safe passage for hikers, bikers, and pedestrians using the Appalachian Trail and BicyclePA Route J. It was completed in November 1986 replacing a 1925 concrete arch toll bridge. At this location, 7 different bridges have crossed the river.
Several incarnations of the Conowingo Bridge crossed the Susquehanna River at the original location of Conowingo, Maryland, United States, about two miles upstream of the Conowingo Dam, which replaced it.
Theodore Burr was an inventor from Torrington, Connecticut, who was credited with the Burr Arch Truss bridge design. He designed and built one of the first bridges across the Hudson River and several bridges that crossed the Susquehanna River.
The Burr Arch Truss—or, simply, Burr Truss or Burr Arch—is a combination of an arch and a multiple kingpost truss design. It was invented in 1804 by Theodore Burr, patented on April 3, 1817, and used in bridges, usually covered bridges.
The Market Street Bridge is a stone arch bridge that spans the Susquehanna River between Harrisburg, Pennsylvania, and Wormleysburg, Pennsylvania. The current structure is the third bridge built at its current location and is the second oldest remaining bridge in Harrisburg. The bridge carries BicyclePA Route J across the river.
Lapidum is a ghost town in Harford County, Maryland, USA, located at the head of navigation of the Susquehanna River on the west bank across from Port Deposit.
The Carl E. Stotz Memorial Little League Bridge, formerly known as the Market Street Bridge, carries approximately 27,700 vehicles a day on U.S. Route 15 over the West Branch Susquehanna River between Williamsport and South Williamsport in Lycoming County, Pennsylvania, in the United States. It is the seventh bridge on the site and was built at a cost of over $60,000,000.
Louis Wernag was a bridge builder in the United States in the early 19th century.
The Trevorton Bridge was an uncovered wooden truss bridge that crossed the Susquehanna River. It was erected between Herndon in Northumberland County and Port Trevorton in Snyder County, Pennsylvania. The bridge was 3,460 feet (1,050 m) long, with a 1,400-foot (430 m) trestle crossing White Island in the middle of the river. It was originally built in 1854 as a railroad bridge by the Susquehanna & Union Bridge Co., later a subsidiary of the Trevorton and Susquehanna Railroad and, in September 1855, the bridge was adapted for use as a road bridge as well as for trains. The bridge was most often used to cross the Susquehanna by cattle. The continuous crossing of cattle endangered the already weakened bridge. The bridge was eventually dismantled in 1870 for fear that it would collapse.
Pennsylvania Route 405 (PA 405) is a 35.124-mile-long (56.527 km) state highway that runs in the north-central part of the U.S. state of Pennsylvania. The southern terminus is an intersection with PA 61 in Sunbury. The route heads across the Susquehanna River to Northumberland and northward along the West Branch Susquehanna River through Milton, Watsontown and Muncy until entering Hughesville, where it terminates at an intersection with U.S. Route 220 (US 220).
The Wells River Bridge between Wells River, Vermont and Woodsville, New Hampshire, is a steel double-decked Baltimore truss bridge over the Connecticut River. It was built in 1903 to carry rail and road traffic.
