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  2. 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.
    en.wikipedia.org/wiki/Covered_bridge
    Many reasons are offered for covering bridges such as providing shelter during inclement weather or so horses wouldn't be afraid to cross the water. However, the real reason is to protect the structure supporting the bridge. Without protection from the weather, the wooden timbers supporting the bridge would decay and eventually collapse.
    coveredbridgesociety.org/cb-faq.html
     
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