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Furnas Mill Bridge

Indiana State Highway Bridge 41-7430

Furnas Mill Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: September 22, 2012
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Key Facts

Facility Carried / Feature Intersected
Pisgah Road (CR-650 South) Over Sugar Creek
Rural: Johnson County, Indiana: United States
Construction Date and Builder / Engineer
1880 By Builder/Contractor: King Bridge Company of Cleveland, Ohio

Technical Facts

Rehabilitation Date
Main Span Length
119 Feet (36.27 Meters)
Structure Length
242 Feet (73.76 Meters)
Roadway Width
13.5 Feet (4.11 Meters)
2 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge was reportedly built ca. 1885. Its distinctive decorative portal bracing knees identify it as a product of the prolific King Bridge Company.

This bridge was reported to have been repaired around 1924. This bridge was more recently rehabilitated under a Transportation Enhancement grant for light vehicular use. The project was designed by J. A. Barker Engineering. The bridge retains its attractive built-up fishbelly floor beams. A creative, non-obtrusive method was used to strengthen this bridge. Rather than replacing members, and adding members, steel beams were hidden inside the top chord and end post. Given the box beam nature of the original top chord and end post, this is an excellent solution since the added beams fit into empty space and are quite nicely hidden by the original beams.

This bridge is located in the Atterbury Fish and Wildlife Area and is in a wooded setting. The light traffic the bridge sees and the recreational nature of the area, make this a great bridge to rehabilitate and preserve.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

A once-prolific Ohio firm probably designed and erected these quite-long and Pratt spans. The crafting of the top chords, endposts, and floor beams suggests that the spans are also very old. The bridge retains its original members, including their decorated portals and bracing.

Architectural Description

An Ohio firm, probably the King Iron Bridge Company of Cleveland, built this two-span, pin-connected Pratt through structure upon cut stone abutments, wingwalls, and pier. The spans extend 118' and 119', respectively, with eight-paneled trusses. The channels used for the top chords and endposts were crafted to make for heavier and stiffer members than the contemporary off-the-shelf rolled stock allowed. A pair of rectangular eyebars, somewhat smaller towards center-span, are used for lower-chord members. Laced channels, decreasing in size toward midspan, provide the intermediate verticals, and a pair of square eyebars supply the hip-vertical suspenders. Each panel beyond the outer or endpost ones carry a pair of rectangualr eyebars as diagonals, and are countered in the two most central panels with an adjustable square bar. U-bolted to the lower pins, girder floor beams made deeper at center than at the ends carry a concrete deck with a 15'11" roadway. Narrow-channel guardrails protect the trusses. The trusses also carry latticed portals with additionally-decorated bracing.

Bridge Considered Historic By Survey: Yes


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