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Wiktionary
covered bridge

n. A bridge with a (usually wooden) house-like structure covering it, to protect it from the elements.

WordNet
covered bridge

n. a bridge whose passageway is protected by a roof and enclosing sides

Wikipedia
Covered bridge

A covered bridge is a timber- truss bridge with a roof and siding which, in most covered bridges, create an almost complete enclosure. The purpose of the covering is to protect the wooden structural members from the weather. Uncovered wooden bridges have a lifespan of only 10 to 15 years because of the effects of rain and sun.

Bridges having covers for reasons other than protecting wood trusses, such as for protecting pedestrians and keeping horses from shying away from water, are also sometimes called covered bridges.

Covered Bridge (Cedarburg, Wisconsin)

The Covered Bridge (originally called Red Bridge) in Cedarburg, Ozaukee County, Wisconsin, United States, is one of the last remaining covered bridges in that state, which once had about 40 covered bridges. Built in 1876 to cross Cedar Creek, the bridge is long and is made of pine with oak lattices. It was listed on the National Register of Historic Places in 1973 and is now used only for pedestrian traffic.