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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.
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.
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.
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 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 ...
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.