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Boyd Bridge

Decatur County Bridge 140

Boyd Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: September 22, 2012

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Key Facts

Facility Carried / Feature Intersected
Pedestrian Walkway Over Greensburg City Park Lake
Location
Greensburg: Decatur County, Indiana: United States
Construction Date and Builder / Engineer
1915 By Builder/Contractor: Pan American Bridge Company of New Castle, Indiana and Engineer/Design: Central States Bridge Company of Indianapolis, Indiana

Technical Facts

Rehabilitation Date
2006
Main Span Length
178.2 Feet (54.32 Meters)
Structure Length
180 Feet (54.86 Meters)
Roadway Width
15.7 Feet (4.79 Meters)
Spans
1 Main Span(s)
NBI Number
1600116

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is an uncommon example of a Camelback truss bridge. The bridge was relocated from CR-700 South over Sand Creek to its current location, where it has been restored for pedestrian use in a park setting. The bridge's trusses retain original design and materials. For a bridge of its size, a fair number of firms were involved with its erection. The Central States Bridge Company of Indianapolis apparently submitted a proposal, and while the county adopted their design, they did not hire them to build the bridge. Instead, they had the Burk Construction Company of New Castle become the general contractor for the bridge. The Burk Construction Company in turn had the Pan American Bridge Company of New Castle fabricate the bridge.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

The only extant Camelback known to have been fabricated by a prolific Indiana firm and one of the oldest riveted structures identified of this truss type, the bridge retains its original members, substructures, and latticed guardrails.

Architectural Description

The Pan American Bridge Company of Newcastle, Indiana, fabricated this all-riveted truss in 1915. Seated upon its cut stone abutments and wingwalls, the 178'6" span consists of ten panels of approximately 18' each which are separated by laced channel verticals. All diagonals and lower chord members are made of angles riveted to stay plates; none contain turnbuckles. The central section of four panels crosses diagonals in the most central two; diagonals for the other center-section panels and for the two panels per side section stretch toward midspan from the top chord to the bottom. I floor beams, riveted to the gussets and the verticals above the lower chord, support the asphalt-over-concrete deck with a 15'8" roadway and 17' of vertical clearance.

Other Information

In January 1915, the Decatur commissioners awarded an $7,180 contract for the construction of the Boyd Bridge to the Burk Construction Company of Newcastle. The contract specified that the superstructure was to be fabricated consistent with the plans which the Central States Bridge Company of Indianapolis had submitted with their otherwise unsuccessful proposal. Burk, who worked closely with the Pan American Bridge Company, turned fabrication over to the metal framers of his hometown. Seated upon its cut stone abutments and wingwalls, hip-verticals of a pair of channels and battens and interior ones of laced channels divide each of the all-riveted trusses into 18-foot panels. Diagonals and lower chord members are made of angles riveted to stay plates; none contain turnbuckles. The central section of four panels are counter-braced. At their highest, the trusses carry a height of 29 feet and six inches. The trusses are stiffened with latticed strut frames made from angles, and braced A's at the portals. Angles also supply the upper lateral braces. I floor-beams, riveted to the gussets and the verticals above the lower chord, support the asphalt-over-concrete deck. Latticed railings line the trusses. The county had the bridge repainted in 1919.

Bridge Considered Historic By Survey: Yes

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