A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath. It is constructed for the purpose of providing passage over the obstacle, usually something that is otherwise difficult or impossible to cross. There are many different designs that each serve a particular purpose and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it and the funds available to build it.
Lumber, also known as timber, is a type of wood that has been processed into beams and planks, a stage in the process of wood production. Lumber is mainly used for structural purposes but has many other uses as well.
A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.
A footbridge is a bridge designed solely for pedestrians. While the primary meaning for a bridge is a structure which links "two points at a height above the ground", a footbridge can also be a lower structure, such as a boardwalk, that enables pedestrians to cross wet, fragile, or marshy land. Bridges range from stepping stones–possibly the earliest man-made structure to "bridge" water–to elaborate steel structures. Another early bridge would have been simply a fallen tree. In some cases a footbridge can be both functional and artistic.
Beam bridges, also known as stringer bridges, are the simplest structural forms for bridge spans supported by an abutment or pier at each end. No moments are transferred throughout the support, hence their structural type is known as simply supported.
Blunham is a village and civil parish in the Central Bedfordshire district of Bedfordshire, England, about 8 miles (13 km) east of Bedford. At the 2011 census date its population was 946. The River Ivel forms the parish's eastern boundary in places and the River Great Ouse its western and northern boundaries. The village is just over 0.6 miles (1 km) to the west of the A1 road, and Route 51 of the National Cycle Network passes to the south.
Fullers Bridge, officially called the Fullers Creek Bridge, is a road bridge that carries Delhi Road to Millwood Avenue across the Lane Cove River, in Chatswood West, Sydney, New South Wales, Australia. The concrete beam bridge is located 9 kilometres (5.6 mi) northwest of the Sydney central business district and connects Chatswood to North Ryde as part of the A38.
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 Forksville Covered Bridge is a Burr arch truss covered bridge over Loyalsock Creek in the borough of Forksville, Sullivan County, in the U.S. state of Pennsylvania. It was built in 1850 and is 152 feet 11 inches (46.61 m) in length. The bridge was placed on the National Register of Historic Places in 1980. The Forksville bridge is named for the borough it is in, which in turn is named for its location at the confluence or "forks" of the Little Loyalsock and Loyalsock Creeks.
The Flat Bridge is a beam bridge across the Rio Cobre on the A1 road connecting the Jamaican capital Kingston, with the north coast tourist areas of Dunn's River and Ocho Rios. It is one of the oldest bridges in Jamaica.
Chesters Bridge was a Roman bridge over the River North Tyne at Chollerford, Northumberland, England, and adjacent to Chesters Roman fort on Hadrian's Wall. The fort, mentioned in the Notitia Dignitatum, and now identified with the fort found at Chesters, was known as Cilurnum or Cilurvum.
The Ashuelot Covered Bridge is a historic wooden covered bridge over the Ashuelot River on Bolton Road, just south of its intersection with NH 119 in Ashuelot, an unincorporated village of Winchester, New Hampshire. Built in 1864-65, it is one of the state's few surviving 19th-century covered bridges. It was listed on the National Register of Historic Places in 1981.
The Covered Bridge in Cedarburg, Ozaukee County, Wisconsin, United States, is one of the last remaining covered bridges in that state, which once had about 40 covered bridges. Built in 1876 to cross Cedar Creek, the bridge is 120 feet (37 m) long and is made of pine with oak lattices. It was listed on the National Register of Historic Places in 1973 and is now used only for pedestrian traffic.
The Taemas Bridge is a two-lane road bridge that carries the Wee Jasper Road across the Murrumbidgee River, at the settlement of Taemas, near Wee Jasper in the Yass Valley Council local government area of New South Wales, Australia. The bridge crosses on the river just before it enters Lake Burrinjuck, which has been created by the Burrinjuck Dam. The bridge is a key part of the road between Yass and Wee Jasper, and from there, to Tumut. The bridge is located approximately 26 kilometres (16 mi) from Yass and 22 kilometres (14 mi) from Wee Jasper. The property is owned by Roads and Maritime Services, an agency of the Government of New South Wales. Under the Heritage Act, 1977 (NSW) s 170, the bridge was added to the New South Wales State agency heritage register on 18 August 2005.
Clackline Bridge is a road bridge in Clackline, Western Australia, 77 kilometres (48 mi) east of Perth in the Shire of Northam, that carried the Great Eastern Highway until 2008. It is the only bridge in Western Australia to have spanned both a waterway and railway, the Clackline Brook and the former Eastern Railway alignment. The mainly timber bridge has a unique curved and sloped design, due to the difficult topography and the route of the former railway. The bridge was designed in 1934 to replace two dangerous rail crossings and a rudimentary water crossing. Construction began in January 1935, and was completed relatively quickly, with the opening ceremony held in August 1935. The bridge has undergone various improvement and maintenance works since then, including widening by three metres (10 ft) in 1959–60, but remained a safety hazard, with increasing severity and numbers of accidents through the 1970s and 1980s. Planning for a highway bypass of Clackline and the Clackline Bridge began in the 1990s, and it was constructed between January 2007 and February 2008. The local community had been concerned that the historic bridge would be lost, but it remains in use as part of the local road network, and has been listed on both the Northam Municipal Heritage Inventory and the Heritage Council of Western Australia's Register of Heritage Places.
Oregon Creek Covered Bridge is a historic bridge that spans Oregon Creek just above its confluence with Middle Yuba River. It is located approximately 3 miles northeast of the community of North San Juan just off California State Route 49 within the Oregon Creek Day Use Area of the Tahoe National Forest.
Banagher Bridge is located northwest of the town of Banagher, and carries the R356 road across the River Shannon between Counties Offaly and Galway in Ireland. The present bridge, constructed between 1841 and 1843 has six masonry arches and had an opening section which has been replaced by a permanent beam.
The Stone kerbing, channels and footbridges of Charters Towers is a heritage-listed group of water infrastructure at various locations in Charters Towers City, Millchester, Queenton, and Richmond Hill throughout Charters Towers, Charters Towers Region, Queensland, Australia. It was built from c. 1884 to 1930s. It was added to the Queensland Heritage Register on 7 February 2005.
The Moxley Covered Bridge is a historic covered bridge carrying Moxley Road across the First Branch White River in southern Chelsea, Vermont. Built in 1886-87, it is the town's only surviving 19th-century covered bridge. It was listed on the National Register of Historic Places in 1974.
The Thetford Center Covered Bridge is a historic covered bridge, carrying Tucker Hill Road across the Ompompanoosuc River in Thetford, Vermont. It is the state's only known example of the Haupt patent truss system. It was listed on the National Register of Historic Places in 1974.
