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Plymouth Railroad Bridge

Pennsylvania Railroad Yellow River Bridge

   


Plymouth Railroad Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: March 4, 2012
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Key Facts

Facility Carried / Feature Intersected
Railroad (Soo Line) Over Yellow River
Location
Plymouth: Marshall County, Indiana
Construction Date and Builder / Engineer
1902 By Builder/Contractor: American Bridge Company of New York, New York

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
Not Available
Structure Length
Not Available
Roadway Width
Not Available
Spans
1 Main Span(s)
NBI Number
Not Applicable

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 railroad pony truss. Through truss bridges and girder bridges are more common. Carrying one track, but designed for two, this bridge has very massive trusses to enable it to support the two track load. The bridge was built in 1902, and as such is a very early example of a bridge built by this very prolific bridge builder, since American Bridge had only been in operation for a couple years.

Information and Findings From DHPA Historic Bridge Survey

Statement of Significance

A national company quite successful with a multitude of railroad contracts erected this bridge. Few, indeed, were the Pratt pony spans built on Indiana's rail system, and this one is among the earliest examples extant. The riveting, the full-hip design, the crafting of heavy members, and the stiffeners all bespeak the designer's will to fashion a span with unusual load-bearing capabilities.

Architectural Description

The American Bridge Company of New York erected this single-span, riveted, and full-hip Pratt pony upon cut-stone abutments. Each of the trusses has eight panels. The endposts and top chords are heavy: crafted channels carry additional reinforcing plates. A pair of channels riveted together iwth cover plates provide substantial lower-chord members, too. All the verticals, diagonals, and counters are made from crafted I-beams. Only the two most central panels are countered. Riveted to gussets and the verticals above the lower chord, heavy girder floor beams carry ties for two rail tracks. Arced stiffeners extend across the inner flanges of the verticals to the tops of the floor beams.

Bridge Considered Historic By Survey: Yes

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Photos and Videos: Plymouth Railroad Bridge

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