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A covered bridge is a timber-truss bridge with a roof, decking, and siding, which in most covered bridges create an almost complete enclosure. [1] The purpose of the covering is to protect the wooden structural members from the weather.
The World Guide to Covered Bridges is published by the National Society for the Preservation of Covered Bridges (NSPCB). [1] It uses a covered bridge numbering system developed by John Diehl, the chairman of the Ohio Covered Bridge Committee. The committee first used the numbering system in 1953 to publish a list of covered bridges in Ohio. [2]
The Buttonwood bridge is also the shortest at 63 feet 6 inches (19.35 m), while the Hillsgrove Covered Bridge in Sullivan County is longest at 171 feet (52 m). On July 2, 1973, the Hillsgrove bridge was the first of the seven to be added to the NRHP, and it was the only one so listed before the Thematic Resources submission. [2]
The bridge housing included flared board-and-batten siding, arched portals, ribbon daylighting and wooden flooring; The bridge has long been closed to vehicular traffic but served pedestrian traffic up until quite recently when the approaches were removed; delisted from the NRHP; by tradition the oldest covered span in Oregon, thought its ...
Infobox templates listed here should also be included in the category buildings and structures infobox templates. Templates that concern a bridge or bridges in an individual country can also be included in a subcategory of buildings and structures templates by country, such as United Kingdom buildings and structures templates.
With the 2011 destruction of the Old Blenheim Bridge, the Bridgeport Covered Bridge is the undisputed longest-span wooden covered bridge still surviving. Historically, the longest single-span covered bridge on record was Pennsylvania's McCall's Ferry Bridge with a claimed clear span of 360 feet (110 m) (built 1814–15, destroyed by ice jam 1817).
This 86.5-foot-long (26.4 m), 18.66-foot-wide (5.69 m), Howe truss bridge was built in 1855. It was renovated by the Works Progress Administration in 1939, and by the city of Philadelphia in 2000. [2] It is the only remaining covered bridge in Philadelphia and is the only covered bridge in a major US city.
Covered bridges are timber-truss bridges with a roof and siding which, in most covered bridges, create an almost complete enclosure. [1]The purpose of the covering is to keep snow from accumulating—winter snow accumulation could easily collapse a bridge, and the steep roof would tend to shed snow to either side.
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