Haupt Truss Bridge, 1300 Ninth Avenue, Railroaders' Memorial Museum, Altoona, Blair County, PA

See also HAER PA-422 for another example of a surviving Haupt iron truss.
Significance: Designed by Herman Haupt, the Haupt iron truss was a rare combination of Pratt truss and tied arch, constructed and used exclusively by the Pennsylvania Railroad between 1851 and 1861. Haupt's were the first metal-tied arch bridges built in this country, and among the first in the world.
Unprocessed Field note material exists for this structure: N22
Survey number: HAER PA-207