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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 covered bridge is a timber-truss bridge with a roof, decking, and siding, which in most covered bridges create an almost complete enclosure. [1]
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
Seventeen historic covered bridges; the three oldest ones are also the longest. U.S. Wisconsin: The only remaining historic covered bridge in Wisconsin is the covered bridge in Cedarburg. [16] [17] There are also the Smith Rapids Covered Bridge in Park Falls built in 1991, [18] and the Springwater Volunteer Covered Bridge built in 1997. [19]
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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]
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Also known as Blind Susie Covered Bridge, locally. [2] Poole's Mill Covered Bridge [1] Cumming, Forsyth County: 1901 94.6 feet (28.8 m) Settendown Creek Town lattice: Listed on the National Register of Historic Places: Rockdale County Covered Bridge: Conyers, Rockdale County: 1997 150 feet (46 m) Mill Rock Creek Decorative lattice: Stone ...