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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]
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.
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.
The bridge structure is built out of a series of panels and other steel elements, joined by rivets, and its deck consists of I-beam stringers covered by a concrete base. [2] The bridge was built in 1911, its trusses built by the American Bridge Company to a design by John W. Storrs, a prolific local bridge engineer. It was originally built as a ...
The bridge housing included flared board-and-batten siding, arched portals, ribbon daylighting and wooden flooring; The bridge has long been closed to vehicular traffic but served pedestrian traffic up until quite recently when the approaches were removed; delisted from the NRHP; by tradition the oldest covered span in Oregon, thought its ...
Name Image County Location Built Length Crosses Ownership Truss Notes Ashland Covered Bridge [1]: New Castle: Ashland: ca. 1860: 52 feet (16 m) Red Clay Creek
The bridge is the only remaining covered bridge in Ontario and the second oldest surviving bridge in the Region of Waterloo. [ 1 ] [ 2 ] (In 2015, the total number of surviving covered bridges in Canada was below 200.) [ 3 ] John Bear, who had previously built barns, built the bridge in 1880–1881, mostly of oak and white pine.
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.