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Covered bridge information


Covered bridge
The Cogan House Covered Bridge, Pennsylvania
The Cogan House Covered Bridge, Pennsylvania
AncestorTruss bridge, others
DescendantNone
CarriesPedestrians, livestock, vehicles
Span rangeShort
MaterialTypically wood beams with iron fittings and iron rods in tension
MovableNo
Design effortLow
Falsework requiredDetermined by enclosed bridge structure, site conditions, and degree of prefabrication

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. 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.[2] In the United States, only about 1 in 10 survived the 20th century.[3] The relatively small number of surviving bridges is due to deliberate replacement, neglect, and the high cost of restoration.[4]

Surviving covered bridges often attract touristic attention due to their rarity, quaint appearance, and bucolic settings. Many are considered historic and have been the subject of historic preservation campaigns.

  1. ^ "Covered bridge". Encyclopædia Britannica. Retrieved 8 October 2012.
  2. ^ "Ohio's Vanishing Covered Bridges". Federal Highway Administration. Retrieved 8 January 2019.
  3. ^ "World Guide to Covered Bridges". National Center for Wood Transportation Structures. Retrieved 8 January 2019.
  4. ^ Ross, Robert J.; et al. (August 2012). "Use of Laser Scanning Technology to Obtain As-Built Records of Historic Covered Bridges" (PDF). U.S. Department of Agriculture. Research Paper FPL-RP-669. Retrieved 9 January 2019.

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