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Albright Bridge

Iowa Bridge Number 171910

Albright Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 1, 2009

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Key Facts

Facility Carried / Feature Intersected
Inkpaduta Avenue Over Boone River
Location
Rural: Hamilton County, Iowa: United States
Structure Type
Metal 8 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1907 By Builder/Contractor: A. H. Austin of Webster City, Iowa

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
156 Feet (47.5 Meters)
Structure Length
207 Feet (63.1 Meters)
Roadway Width
15.7 Feet (4.79 Meters)
Spans
1 Main Span(s) and 2 Approach Span(s)
NBI Number
171910

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This eight panel pin-connected through truss has a main span of 156 feet making it one of the longest pin-connected Pratt spans in the state. As a later example of a pin-connected truss bridge, it is traditionally composed, representing the standardization in bridge parts and overall design that had firmly taken root by the early 20th Century. That said, the orientation and tightness of the v-lacing of the truss is different from what the majority of this type of bridge display. The tight v-lacing is a function of a stronger beam which is a function of a later example of a pin-connected truss bridge. The bridge also includes two steel stringer approach spans. There are also caisson (lally column) piers present on the bridge. Original hub guard style lattice railing remains present on both the main and approach spans. The bridge appears to retain good historic integrity with no alterations to the superstructure noted, although the abutments may have been repaired at some point.

Information and Findings From Iowa's Historic Bridge Inventory

Discussion of Bridge

This long-span steel truss carries an unpaved county road across the Boone River in Independence Township, south of Webster City. The structure consists of a single pinned Pratt through truss supported by steel cylinder piers, with steel stringer approach spans on both ends. The history of the Albright Bridge dates to April 1907, when the Hamilton County Board of Supervisors contracted with Webster City contractor A.H. Austin to supply and build the steel truss. Austin worked on the construction throughout the remainder of the year; by early January 1908 the Albright Bridge had been completed. It has since carried vehicular traffic in essentially unaltered condition.

Roughly 175 pinned Pratt through trusses were identified during Clayton Fraser's state historic bridge inventory in the early 1990s. These ranged in span length form 64 feet to 180 feet (the average is about 110 feet), and in fabrication date between 1874 and 1937 (with the average about 1902). With a span length of 156 feet, the Albright Bridges is distinguished as one of the longest pinned Pratt trusses remaining in Iowa. It is thus an important example of this mainstay structural type [adapted from Fraser 1990].

Bridge Considered Historic By Survey: Yes

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Maps and Links: Albright Bridge

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