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Old IN-37 Bridge

Morgan County Bridge 224

Old IN-37 Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: September 23, 2012
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Key Facts

Facility Carried / Feature Intersected
Old IN-37 Over Indian Creek
Rural: Morgan County, Indiana: United States
Construction Date and Builder / Engineer
1926 By Builder/Contractor: Vincennes Bridge Company of Vincennes, Indiana

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
77 Feet (23.47 Meters)
Structure Length
236.6 Feet (72.12 Meters)
Roadway Width
19 Feet (5.79 Meters)
3 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge is an early state standard plan truss bridge. It is noted for its multi-span design (uncommon among pony truss bridges) and its skewed orientation. The bridge is on old state highway alignment which is today a local road. The bridge retains good historic integrity with no major alterations.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

One of the state's longer structures of its kind to survive, the heavy-duty and unadorned spans are of standard design. The whole retains its integrity.

Architectural Description

Concrete abutments, wingwalls, and piers support the three-span Warren pony truss. The riveted structure extends 232' in seven panels for each span. The western trusses are offset about one panel to the south. The all-interior verticals are manufactured from pairs of angles riveted together with stay plates and reinforced with external sway bracing. The diagonals, growing increasingly lighter toward midspan, are made of a pair of angles (doubled in the outer panel) also riveted together with stay plates. The I floor beams are riveted to gussets and the verticals above the lower chord and carry the concrete deck with its 20' roadway.

Other Information

The Vincennes Bridge Company of Vincennes, Indiana, bid $27,558.47 to build this three-span skewed structure (30deg.L) on concrete abutments and piers in July 1925. The bid came in about seven thousand below the state engineers' estimate, although in the end Vincennes was paid two thousand dollars over its bid. The bridge was complete by July 1926. The ISHC relied on an early standard plan for 77-ft., riveted, half-hip, Warren pony-truss spans with 20-ft. roadways. The 8-ft. 9-in. deep trusses carry seven 11-ft. wide panels. The external sway braces share battens with the all-interior verticals--each of two pairs of angles (3.5"x2.5"Ls) riveted together. The diagonals are heavier towards the ends (4Ls@3.5x3) than toward midspan (2Ls@3.5"x2.5"), each member riveted together with battens. The upper and lower chord members, on the other hand, become increasingly heavier toward midspan. For the top, a pair of 10-in. channels grow from 15.3 lbs to 20 lbs. For the bottom, a single pair of angles (6"x3.5"Ls) serve in the outer panel; thereafter the pairs are doubled. The ISHC specified fairly heavy I-floor-beams (24"@79.9#). These were riveted to the verticals above the lower chord and to their sides were attached seven rows of rolled 10-in. Is (@25.4#) as stringers, together carrying the concrete deck. Angles supply the lower sway bracing. Post and channel guardrails line the trusses.

This is probably the oldest extant state-design Warren pony-truss structures. It is multi-span, skewed, and retains its original members. A notable Indiana bridge builder fabricated and erected the trusses along with the substructure.

Bridge Considered Historic By Survey: Yes


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