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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.
The original bridge washed away in 1899 and was replaced with the present 96-foot structure in 1901. Constructed in the Town lattice design by Bud Gentry, the bridge's web of planks crisscrossing at 45-to 60-degree angles are fastened with wooden pegs, or trunnels, at each intersection."
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 .
The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. [5]
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 Taftsville Covered Bridge is a timber-framed covered bridge which spans the Ottauquechee River in the Taftsville village of Woodstock, Vermont, in the United States. [1] Built in 1836 and exhibiting no influence from patented bridge designs, [1] it is among the oldest remaining covered bridges both in Vermont [2] and the nation as a whole. [3]
Peter Paddleford (1785–1859) was a covered bridge builder who designed a new wooden bridge truss, one he never patented. The design was used widely throughout New Hampshire, Maine, and Eastern Vermont during much of the 19th century.
Only bridge in the US using this design [6] Pisgah Community Covered Bridge [1] Randolph: Pisgah: ca. 1910: 51 feet (16 m) Upper branch of the Little River Private: Modified queen: Will Henry Stevens Covered Bridge [7]: 61 Macon: Highlands