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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 .
Media related to Green Sergeant's Covered Bridge at Wikimedia Commons; Historic American Buildings Survey (HABS) No. NJ-442, "Covered Bridge, Wickecheoke Creek, Sergeantsville, Hunterdon County, NJ", 2 photos, 6 measured drawings, 3 data pages, supplemental material
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.
The World Guide to Covered Bridges is published by the National Society for the Preservation of Covered Bridges (NSPCB). [1] It uses a covered bridge numbering system developed by John Diehl, the chairman of the Ohio Covered Bridge Committee. The committee first used the numbering system in 1953 to publish a list of covered bridges in Ohio. [2]
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.
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