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 could 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.
A truss is an assembly of members such as beams, connected by nodes, that creates a rigid structure.
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements may be stressed from tension, compression, or sometimes both in response to dynamic loads. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by 19th and early 20th-century engineers. A truss bridge is economical to construct because it uses materials efficiently.
A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames. A trestle is a rigid frame used as a support, historically a tripod used to support a stool or a pair of isosceles triangles joined at their apices by a plank or beam such as the support structure for a trestle table. Each supporting frame is a bent. A trestle differs from a viaduct in that viaducts have towers that support much longer spans and typically have a higher elevation.
A lattice girder is a truss girder where the load is carried by a web of latticed metal.
Fallasburg Bridge is a 100-foot (30 m) span Brown truss covered bridge, erected in 1871 in Vergennes Township, Michigan, United States, 5 miles (8.0 km) north of Lowell on the Flat River. Carrying Covered Bridge Road across the Flat, it is located in the Fallasburg Historical District south of Whites Bridge and Smyrna. It is listed on the National Register of Historic Places, and along with Whites Bridge, Langley Covered Bridge, and Zehnder's Holz Brucke, is one of only four Michigan covered bridges open to vehicle traffic.
The Waterford Covered Bridge is a Town lattice truss covered bridge spanning LeBoeuf Creek in Waterford Township, Erie County in the U.S. state of Pennsylvania. The bridge was built in 1875, and is 85 feet 11 inches (26.2 m) in length. The Waterford Covered Bridge is one of two remaining covered bridges in Erie County, along with the Harrington Covered Bridge. The bridge is also the only Town lattice truss bridge in the county and one of only 19 in Pennsylvania. It was documented by the Historic American Buildings Survey in 1936 and was listed on the National Register of Historic Places in 1980. In 2011, the bridge was closed due to its deteriorating condition.
The Prince Alfred Bridge is a wrought iron truss and timber beam partially-disused road bridge over the Murrumbidgee River and its floodplain at Middleton Drive, Gundagai, Cootamundra-Gundagai Regional Council, New South Wales, Australia. The heritage-listed road bridge was designed by William Christopher Bennett and built from 1864 to 1867 by Francis Bell. It is also known as Prince Alfred Bridge – Iron Road Bridge and Iron Bridge over Murrumbidgee River at Gundagai. The iron bridge is owned by Transport for NSW and the timber viaduct is owned by Crown Lands. The bridge was added to the New South Wales State Heritage Register on 5 July 2019 and on the Register of the National Estate on 21 March 1978.
The Martin's Mill Covered Bridge is a wooden covered bridge spanning Lull's Brook on Martinsville Road in Hartland, Vermont. Built about 1880, it is one of two surviving 19th-century covered bridges in the town. It was listed on the National Register of Historic Places in 1973.
The Upper Falls Covered Bridge, also known as the Downers Covered Bridge, spans the Black River, carrying Upper Falls Road just south of Vermont Route 131 in western Weathersfield, Vermont. The Town lattice truss bridge was built in 1840 and rebuilt in 2008. Its gable ends are distinctive for their Greek Revival styling. The bridge was listed on the National Register of Historic Places in 1973.
Morpeth Bridge is a heritage-listed road bridge over the Hunter River at Morpeth, New South Wales, Australia. It was designed by Percy Allan and built from 1896 to 1898 by Samuel McGill. It is also known as Morpeth Bridge over the Hunter River. The property is owned by Transport for NSW.
The Macdonald River railway bridge is a heritage-listed railway bridge that carries the Main Northern Line across the Macdonald River located in Woolbrook, in the Walcha Shire, New South Wales, Australia. The railway bridge was designed by John Whitton as the Engineer-in-Chief for the New South Wales Government Railways and built during 1882 by J. S. Bennett, with iron work by J. & C. Brettell, Worcester, England. The railway bridge is also known as the Woolbrook rail bridge over the Macdonald River and the Woolbrook Lattice Railway Bridge. The bridge and adjacent infrastructure is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. The bridge was added to the New South Wales State Heritage Register on 2 April 1999 and was added to the Register of the National Estate on 18 April 1989.
The Macquarie River railway bridge is a heritage-listed disused railway bridge across the Macquarie River that was previously located on the Main Western line in Bathurst in the Bathurst Region local government area of New South Wales, Australia. It was built in 1876. It is also known as Bathurst Rail Bridge over Macquarie River and Bathurst – Kelso Railway Bridge. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. The bridge was added to the New South Wales State Heritage Register on 2 April 1999 and was added to the Register of the National Estate on 18 April 1989.
The Dubbo rail bridge over Macquarie River – Wambuul is a heritage-listed railway bridge on the Main Western line across the Macquarie River, located west of the Dubbo central business district in New South Wales, Australia. It was designed by John Whitton as the Engineer-in-Chief for the New South Wales Government Railways. The bridge was built during 1884 by Benjamin Barnes, with ironwork by Cochrane & Co, Middlesborough, England. The railway bridge is also known as the Dubbo Lattice Railway Bridge. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. The bridge was added to the New South Wales State Heritage Register on 2 April 1999 and was listed on the Register of the National Estate on 18 April 1989.
The Bredbo River railway bridge is a heritage-listed former railway bridge carrying the Bombala railway line over the Bredbo River at Bredbo in the Snowy Monaro Regional Council local government area of New South Wales, Australia. It was designed by John Whitton in his capacity as Engineer-in-Chief for Railways and built from 1881 to 1889. It is also known as the Bredbo Rail Bridge and the Bredbo River Railway Viaduct. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999. On 1 December 2020, changes were made to exemptions relating to the bridge's heritage status.
The Tenterfield Creek railway bridge is a heritage-listed former railway bridge that carried the Main North Line across the Tenterfield Creek from Sunnyside to Jennings, both in the Tenterfield Shire local government area of New South Wales, Australia. It was designed by John Whitton and Engineer-in-Chief for NSW Government Railways and built in 1888. The bridge is also known as the Sunnyside rail bridge over Tenterfield Creek. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales and was added to the New South Wales State Heritage Register on 2 April 1999.
The Peel River railway bridge is a heritage-listed railway bridge that carries the Main North line across the Peel River connecting North Tamworth to Tambinda, both in the Tamworth Regional Council local government area of New South Wales, Australia. The railway bridge was designed by John Whitton as the Engineer-in-Chief for Railways and built during 1882 by J. S. Bennett, with iron work by J. & C. Brettell, Worcester, England. The bridge is also known as the Tamworth rail bridge over Peel River and the Tamworth Lattice Railway Bridge. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. The bridge was added to the New South Wales State Heritage Register on 2 April 1999 and was added to the Register of the National Estate on 18 April 1989.
The Yarraford Rail Bridge is a heritage-listed closed railway bridge that carried the Main Northern Line across Beardy Waters, situated 694.371 kilometres (431.462 mi) from Central station, near Glen Innes, in the Glen Innes Severn local government area of New South Wales, Australia. The bridge was designed by John Whitton in his capacity as Engineer-in-Chief for Railways and built in 1886. It is also known as Beardy River Railway Viaduct. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999.
The Severn River railway bridge is a heritage-listed railway bridge that carries the Main Northern Line across the Severn River at Dundee, Glen Innes Severn, New South Wales, Australia. It was designed by John Whitton in his capacity as Engineer-in-Chief for Railways and built in 1886. It is also known as Severn River Railway Viaduct. The property is owned by Transport Asset Holding Entity, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999.
