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America's Historic Covered Timber Bridges
Snapshot: Covered wooden bridges proliferated in the United States in the mid-nineteenth century. Today an estimated 800 covered bridge structures remain as cherished links to the technological heritage of the United States. The through-truss designs vary from the Kingpost trusses built in the craft tradition to the engineered Burr arch and Paddleford trusses. Covered bridges are links to the past and the pioneering bridge-building efforts and, as such, are considered important early American transportation structures to preserve for posterity.
The Portland Mills Covered Bridge in Parke County, Indiana, has a Burr-Archtruss design. James Wacker, Forest Service