Kinzua Bridge
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The Kinzua Bridge or the Kinzua Viaduct was a railroad trestle that spanned Kinzua Creek in McKean County in the U.S. state of Pennsylvania. The bridge was 301 feet (92 m) tall and 2,052 feet (625 m) long. Most of its structure collapsed during a tornado in July 2003.
The bridge before its collapse
The original Kinzua Bridge, before its reconstruction in 1900
Historic American Engineering Record (HAER) photo of the bridge in July 1971
The Kinzua Bridge, in 2001, before its collapse
Trestle bridge
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A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames. A trestle is a rigid frame used as a support, historically a tripod used to support a stool or a pair of isosceles triangles joined at their apices by a plank or beam such as the support structure for a trestle table. Each supporting frame is a bent. A trestle differs from a viaduct in that viaducts have towers that support much longer spans and typically have a higher elevation.
Trestles are useful as approaches to bridges over marshes and shallows.
Trestle of wooden posts, beams, and diagonal braces
Kinzua viaduct over the Kinzua Creek valley in Pennsylvania
Interurban train trestle, completed after the 1915 Galveston Hurricane