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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.
A lattice truss bridge is a form of truss bridge that uses many small, closely spaced diagonal elements forming a lattice. The design was patented in 1820 by architect Ithiel Town .
Examples of truss construction on covered bridges include Howe, Town Lattice, Queen-post, King-post, Haupt, Burr, Brown and Pratt. Of the existing historic covered bridges in Alabama, the Gilliland-Reese Covered Bridge and the Old Union Crossing Covered Bridge are classified as non-authentic based on their current construction.
Covered bridges are timber-truss bridges with a roof and siding which, in most covered bridges, create an almost complete enclosure. [1]The purpose of the covering is to keep snow from accumulating—winter snow accumulation could easily collapse a bridge, and the steep roof would tend to shed snow to either side.
This 86.5-foot-long (26.4 m), 18.66-foot-wide (5.69 m), Howe truss bridge was built in 1855. It was renovated by the Works Progress Administration in 1939, and by the city of Philadelphia in 2000. [2] It is the only remaining covered bridge in Philadelphia and is the only covered bridge in a major US city.
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Downsville Bridge is a wooden covered bridge over the East Branch of the Delaware River in the hamlet of Downsville in Delaware County, New York. Designed by Scottish immigrant Robert Murray, the bridge was built in 1854, and is a single span, timber and plan framed bridge. The bridge measures 174 feet (53 m) long and 19 feet (5.8 m) wide. [2]: 5
Hamden Bridge is a wooden covered bridge over the West Branch of the Delaware River in the hamlet of Hamden in Delaware County, New York. It was built in 1859, and is a single span, timber and plan framed bridge. It measures 128 feet long and 18 feet wide. A supporting center pier was added in 1940. [2]: 5