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Hart Road Bridge

Martin County Bridge 59

Hart Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 22, 2021

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Key Facts

Facility Carried / Feature Intersected
Hart Road (CR-450 West) Over Boggs Creek
Rural: Martin County, Indiana: United States
Structure Type
Metal 3 Panel Pin-Connected Pratt Half-Hip Pony Truss, Fixed and Approach Spans: Metal 4 Panel Pin-Connected Pratt Half-Hip Pony Truss, Fixed
Construction Date and Builder / Engineer
1900 By Builder/Contractor: Champion Bridge Company of Wilmington, Ohio

Technical Facts

Rehabilitation Date
Main Span Length
62 Feet (18.8 Meters)
Structure Length
111 Feet (33.8 Meters)
Roadway Width
11.8 Feet (3.6 Meters)
1 Main Span(s) and 1 Approach Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge with its two unequal spans is a rare example of a multi-span pin-connected pony truss bridge. Most surviving pony truss bridges with pin connections are single span bridges. This bridge is also a notable example of the Champion Bridge Company, which was more prolific in other states like Ohio and Tennessee.

The National Bridge Inventory showed a 1913 construction date, however the DHPA notes listed a ca. 1900 date. Given the lightweight trusses, and built-up floorbeams, and the stone substructure, the 1900 date seems more likely.

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

Information and Findings From DHPA Historic Bridge Survey

Bridge History and Significance

Built by the Champion Bridge Company of Wilmington, Ohio, the two-span, pin-connected Pratt pony truss rests upon its original cut stone abutments, wingwalls, and pier. The structure extends 113' in three and four panels each. Its verticals are fabricated of laced pairs of angles and its diagonals of a pair of die-forged and rectangular eyebars countered by an adjustable bar in the center panels of the longest span and crossed in the center panel of the shortest span. I floor-beams, which are double U-bolted to the lower pins, carry the timber deck with its 12' roadway. One of three extant Pratt ponies fabricated by the prolific Ohio firm, this is also one of the three surviving two-span structures of this truss type in Indiana. The unadorned bridge retains its original substructure and metal members, although some have undergone repair. The truss design is quite standard. References Bridge nameplate. American Consulting Engineers, Inc., Bridge Inspection/Reinspection Report: Martin County (Indianapolis, 1974, 1979).

Bridge Considered Historic By Survey: Yes


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