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Boner Bridge

Pyeatt's Mill Bridge, Warrick County Bridge 273, Spencer County Bridge 276

Boner Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 27, 2019

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Key Facts

Facility Carried / Feature Intersected
Boner Road Over Little Pigeon Creek
Rural: Warrick County, Indiana and Spencer County, Indiana: United States
Structure Type
Metal 14 Panel Threaded Rod-Nut Connected Bowstring Through Truss, Fixed and Approach Spans: Metal Threaded Rod-Nut Connected Bowstring Pony Truss, Fixed
Construction Date and Builder / Engineer
1869 By Builder/Contractor: King Bridge Company of Cleveland, Ohio

Technical Facts

Rehabilitation Date
Main Span Length
160 Feet (48.8 Meters)
Structure Length
261 Feet (79.6 Meters)
Roadway Width
11.8 Feet (3.6 Meters)
1 Main Span(s) and 2 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This extremely rare multi-span bowstring truss bridge is one of the oldest bridges of its kind and also sits on rare patented cast iron bents. With its 1869 construction date, it is one of the earliest known King Bridge Company bowstring truss bridges. The bridge sits on rare cast iron bents that were a patented design.

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

View Patent For This Bridge's Piers

Interpretive Signage Text:

The oldest surviving metal bridge in Indiana. Seated at its end on cut-stone abutments quarried at Grandview, Indiana and erected by Solomon Bridge, Herman Tribbe, and Herman Wilbern. The center spans rest on the only cast-iron piers still in existence in the state and built to the design of Almon B. Ives of Bloomington, Illinois.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

This 259' bowstring arch structure of one 160', 14-panel through and two 48'6", 5-panel pony spans rests upon stone abutments reinforced with concrete and metal A-frame piers. The spans follow the patented tubular arch of the King Bridge Company. A pair of rectangular die-forged bars extended through the shoe of the arch provide the lower chord. Cylindrical eyebars provide the verticals and the crossed diagonals of each panel are adjusted through the arch. The I floor-beams rest upon the lower chord and are further stabilized by external braces bolted to the arch-chord. The timber deck carries a 16' roadway. The longest of two such throughs extant and the longest bowstring structure in Indiana, this bridge was probably designed by a prolific Ohio firm, four of whose other bowstring ponies still survive in the state. The spans have been rehabilitated and the floor-beams reinforced, although the bridge appears to retain most of its original members, including some latticed guardrail. The consulting engineers who have inspected both counties' bridges also designed the rehabilitation of this "unusual structure." References MW, Inc., Warrick County Bridge Re-Inspection Report (Indianapolis, 1978). Engineer Associates, Inc., Bridge Reinspection Report: Warrick County (Evansville, 1981). United Consulting Engineers, Inc., Bridge Reinspection Report: Warrick County (Indianapolis, 1987). WTH Engineering, Warrick County: Bridge Reinspection Report (Indianapolis, 1999). Associated Engineering Consultants, Inc., Bridge Reinspection Study and Report: Spencer County (Nashville, 1979). Indiana Historic Sites & Structures Inventory, Gibson County and Warrick County: Interim Report (Indianapolis, 1984), 84. Ohio Department of Transportation, Ohio Historic Bridge Inventory Evaluation, and Preservation Plan (Columbus,1983), 36-7.

Bridge Considered Historic By Survey: Yes


Photo Galleries and Videos: Boner Bridge

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