Covered bridges

A covered bridge is a timber-truss bridge with a roof 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 have a life span of only 10 to 15 years because of the effects of rain and sun.[2]

Bridges having covers for reasons other than protecting wood trusses, such as for protecting pedestrians, are also sometimes called covered bridges.

Source: http://en.wikipedia.org/wiki/Covered_bridge

 

Advertisements