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The only maintenance a Howe truss requires is adjustment of the nuts on the vertical posts to equalize strain. [1] The diagonals in a wooden Pratt truss proved difficult to keep in proper adjustment, so the Howe truss became the preferred design for a wooden bridge [1] or for a "transitional" bridge of wood with iron verticals. [2]
The bridge was built about 1844 by,thy and is the state's only surviving example of a Howe truss in timber on a public roadway. It is also a comparatively early example of the truss type in general; the Howe truss was patented in 1840. It is furthermore the only surviving 19th-century covered bridge in the town of Stowe. [2]
It is located about 0.2 miles (0.32 km) west of the Shoreham-Depot Road, and is accessible on foot via the former railroad right-of-way, now (along with the bridge) a state-owned property. It is a single-span Howe truss structure, 109 feet (33 m) in length, and set on dry-laid stone abutments faced in concrete.
The Union Covered Bridge is the only Burr-arch truss covered bridge still extant in Missouri; the other three covered bridges remaining in Missouri are examples of the Howe truss. The Burr design uses multiple king posts and an arch to support the bridge's truss. The Union Covered Bridge specifically has two arches on either side of the bridge. [6]
The McConnell's Mill bridge is particularly significant for its usage of the Howe truss design; it is one of only four extant Howe truss bridges statewide. [2]: 2 In 1980, the bridge was recognized for its historical significance by being placed on the National Register of Historic Places, [1] along with the Banks Bridge. [4]
William Howe (May 12, 1803 – September 19, 1852) was an American architect and bridge builder famous for patenting the Howe truss design for bridges in 1840. [ 1 ] Life and career
The Burkeville Covered Bridge is a historic covered bridge, carrying Main Poland Road over the South River in Conway, Massachusetts.Probably built in 1870, it is a regionally rare example of a multiple kingrod bridge with iron tensioning verticals (a modified Howe truss system), and one of a few 19th century covered bridges to survive in Massachusetts.
In addition to spanning the river, the bridge crosses a historic millrace north of the river. The bridge sections consist of Howe trusses formed out of wooden planks bolted together, with wrought iron tension rods, all joined by wrought iron bearing blocks. The exterior of the bridge is finished in vertical board siding, with a metal roof. [4]