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280th Street Bridge

280th Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 9, 2013

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Key Facts

Facility Carried / Feature Intersected
6th Street Liberty Trail Over Drain
Location
Independence: Buchanan County, Iowa: United States
Construction Date and Builder / Engineer
1898 By Builder/Contractor: D. H. Young of Manchester, Iowa

Technical Facts

Rehabilitation Date
2004
Main Span Length
24 Feet (7.32 Meters)
Structure Length
39 Feet (11.89 Meters)
Roadway Width
15.4 Feet (4.69 Meters)
Spans
1 Main Span(s)
NBI Number
81330

Historic Significance Rating (HSR)

Bridge Documentation

This bridge is a rare example of a Kingpost pony truss. It is traditionally composed and retains good historic integrity. It was originally located on 280th Street and in 2004 is was relocated here at the western end of 6th Street where it carries pedestrians, connecting 6th Street to the Liberty Trail, which is a trail for non-motorized traffic.

Information and Findings From Iowa's Historic Bridge Inventory

Discussion of Bridge

This kingpost pony truss carries 280th Street, a gravel-surfaced county road, across a small stream in southwestern Buchanan County, five miles southwest of Independence. This structure was built in 1898 by D.H. Young of Manchester just prior to the widespread introduction of the Pratt pony truss design in the county. The bridge was part of an eight-bridge contract let to Young for $3,304.70 that year. Young had been active in Buchanan County since 1893 and was the contractor for most of the county bridges built between 1896 and 1899. Supported by a timber substructure and featuring a timber deck with two angle lattice guardrails, this pony truss maintains an excellent degree of physical integrity, as it continues to carry traffic in its rural setting. With its roots extending to the Middle Ages, the kingpost pony truss is the most rudimentary truss type. Numerous kingposts were built on Iowa's early roads in the late 19th and early 20th centuries, executed first as timber-iron combination structures and later in all-metal configurations. The kingpost as a structural type was limited to relatively short-span applications, however, and as steel beam bridges received widespread acceptance after the turn of the century, erection of kingpost trusses declined rapidly. This bridge in Buchanan County is a typically configured early example of kingpost truss fabrication. Its modern substructure diminishes its physical integrity somewhat, but the structure is nevertheless a well-preserved and noteworthy example of a now-uncommon structural type. Since the site was nominated for the National Register, the bridge has been moved and now lies on a pedestrian trail ion the SW 6th Street Liberty Trail in a park in Independence [adapted from Hybben, Roise, and Fraser 1992].

Bridge Considered Historic By Survey: Yes

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