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Standardsburg Road Bridge

   


Standardsburg Road Bridge

Primary Photographer(s): Rick McOmber

Bridge Documented: April 18, 2009 and 2013
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Key Facts

Facility Carried / Feature Intersected
Standardsburg Road (TR-90) Over West Branch Huron River
Location
Rural: Huron County, Ohio
Construction Date and Builder / Engineer
1926 By Builder/Contractor: Pan American Bridge Company of New Castle, Indiana and Engineer/Design: Standard Engineering and Contracting Company

Technical Facts

Rehabilitation Date
2012
Main Span Length
118 Feet (35.97 Meters)
Structure Length
128 Feet (39 Meters)
Roadway Width
19.7 Feet (6 Meters)
Spans
1 Main Span(s)
NBI Number
3931072

Historic Significance Rating (HSR)

Bridge Documentation

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

View The Original Plans For This Historic Bridge

This bridge is a traditional 1920s through truss. It retains good historic integrity aside from missing original railings. Prior to 2012, the bridge was in poor shape, and the need to rehabilitate this historic bridge was apparant. There was section loss in some places on the bridge. The most easily noticeable trouble area was v-lacing on the end post that had suffered severe loss of section. Despite these conditions, the bridge could still be rehabilitated. Given the rapid rate of truss bridge demolition in Ohio, even bridges like this 1920s structure are rapidly becoming rare, and will continue to do so until Ohio realizes a comprehensive historic bridge preservation plan is needed in the state.

Fortunately, Huron County recognized that the solution to improving infrastructure, saving money, and preserving history all have a common solution and in 2012 chose to comprehensively rehabilitate this historic bridge. MID-OHIO Structures completed the rehabilitation which included galvanizing the trusses to protect them from corrosion. New guardrails replacing the previous non-original guardrail on the bridge protect the trusses from vehicular collision.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge carries a 2 lane road over a stream in a sparsely developed, rural setting.

Physical Description

The 1 span, 128'-long, rivet-connected Warren with verticals thru truss bridge is traditionally composed of built-up members. It has beam guide rails replacing original lattice railings and steel deck pan that were placed as part of a rehabilitation project in 1994.

Integrity

Replacement railings (1994).

Summary of Significance

The 1926 rivet-connected Warren thru truss bridge is a late example of its type/design with no distinguishing features or details. Warren trusses are the most common design found in Ohio and the nation. The Ohio Phase 1A survey (2008) has identified more than 500 examples dating from 1897 to 1961, accounting for well over half of the approximately 800 pre-1961 metal trusses. The Warren design was particularly well suited to rigid (riveted, and later welded connections), but not as well suited to pin connections; this helps to explain its popularity in the 20th century rather than the 19th century, although it is based on a British patent issued to engineers James Warren and Willoughby Monzani in 1848. In the U.S., the popularity of the Warren truss coincided with improvements in pneumatic field riveting equipment starting about 1900. The Warren, which is based on a series of equilateral triangles, is identified by its simplicity of design, ease of construction with equal-sized members, and ability of some diagonals to act in both tensions and compression. Warren trusses are often stiffened by the addition of verticals; they can also have polygonal (sloped) upper chords to achieve greatest depth at midspan.

Warren trusses were a standard design of the Ohio State Highway Department in the 1910s and 1920s, but they achieved their greatest popularity with county engineers, who purchased the bridges from Ohio fabricators such as the Champion Bridge Co. and the Mt. Vernon Bridge Co. Fewer than 25 surviving rivet-connected Warren trusses date prior to 1915, and they represent the period when the rivet-connected design solidified its position as the most popular prefabricated county truss design.

Bridge Considered Historic By Survey: No

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