Lancaster county, Pennsylvania has an abundance of covered bridges like the Weaver's mill bridge above. They are an interesting part of history and make great photography subjects. The purpose of the covering is to protect the wooden structural members and flooring from the weather. Uncovered wooden bridges have a lifespan of only 10 to 15 years because of the effects of rain and sun. Wooden bridges with covers last for centuries. Bridges having covers for reasons other than protecting wood trusses, such as for protecting pedestrians and keeping horses or cattle from shying away from water, are also reasons for covers on the bridges.
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