This bridge is one of only a couple surviving examples of a bridge design built by the Indiana Bridge Company of Muncie, Indiana and marketed as a High Triangular truss. The truss design is unique, not copied by any other known company. It is essentially a pin-connected Polygonal Warren truss. Polygonal Warren truss bridges are otherwise limited to riveted connections among known surviving simple span truss bridges. The design of this bridge is similar, but not exactly the same as the patented Pegram truss bridge type. As a rare surviving example of this highly unusual truss type, this bridge should receive the highest preservation priority.
Information and Findings From DHPA Historic Bridge Survey
Statement of Significance
Two such polygonal chord triangulars remain in Indiana (the other is Kidner Bridge/Grant #160) and one in Ohio (Preble County). Each of these most unusual through trusses was designed and fabricated by a prolific
Hoosier firm which still has its original plans. Except for replacement of some of the original latticed guardrail, this structure appears to retain its original members.
The Indiana Bridge Company of Muncie erected this 183', pin-connected "triangular" or Warren through truss upon masonry abutments and wingwalls for $5,465. Verticals of die-forged eyebars divide the truss into
twelve panels. The top chord for the two most central panels is parallel to the lower chord; the angle varies for each adjacent pair of panels. The diagonals stretching in and out from the 5th and 7th top panel points (the ends of
the parallel section of the top chord), as well as those stretching from the top 3rd and 9th to the lower 2nd and 10th panel points respectively, are made of two pairs of angles laced into channels and then together; pairs of
die-forged eyebars complete the pattern of diagonals. Riveted to pin-plates, I floor beams carry the asphalt deck with its 15'6" roadway and 17' of vertical clearance. The lower lateral bracing angles through the center of every
other floor beam.
Bridge Considered Historic By Survey: Yes
Coordinates (Latitude, Longitude):
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