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CR-16 Bridge

CR-16 Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: Fall/Winter 2006

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Key Facts

Facility Carried / Feature Intersected
CR-16 Over Beaver Creek
Location
Rural: Williams County, Ohio: United States
Construction Date and Builder / Engineer
1914 By Builder/Contractor: Brookville Bridge Company of Brookville, Ohio

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
52.2 Feet (15.91 Meters)
Structure Length
54 Feet (16.46 Meters)
Roadway Width
16 Feet (4.88 Meters)
Spans
1 Main Span(s)
NBI Number
8633908

Historic Significance Rating (HSR)

Bridge Documentation

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

This is a small bridge that is seated on concrete abutments. Although there is paint remaining on the bridge, the structure is in poor condition, particularly under the deck. Some of the lateral bracing is falling off the bridge. Bridge like this one might not be the most historically significant of metal truss bridges, yet their small size makes preservation inexpensive. As such, restoring this bridge, located on a quiet paved road, is worthwhile.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge carries a 2 lane road over a stream in a rural setting with scattered 20th century residences.

Physical Description

The 1 span, 54'-long, rivet-connected Warren pony truss bridge is traditionally composed of built-up members. It has lattice railings, concrete deck, and is supported on concrete abutments.

Summary of Significance

The 1920 Warren pony truss is a later example of its type/design with no distinguishing features. It has riveted connections, typical of Warren trusses from about 1900 to the 1940s when riveted connections began to be phased out in favor of welded connections. The weld-connected Warren trusses continue to be a popular bridge type/design on county roads in Ohio. 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.

A noteworthy change in the technological development of Warren trusses was the transition from riveted to welded connections that began in the mid to late 1930s. The development was based on improvements in arc-welding equipment and the propagation of welding techniques as a substitute for riveting in many fields of construction, such as steel-hull ships and steel-frame buildings. While most of Ohio's remaining truss fabricators went out of business in the depression of the 1930s, Ohio Bridge Corporation (OBC) of Cambridge grew its business on the development of a standard weld-connected Warren pony truss with polygonal upper chords in the years immediately following WWII. OBC remains in operation and many Ohio counties continue to find the weld-connected Warren trusses to be a desirable economical alternative to other bridge types. More than 360 of the 500 Warren trusses in the study are weld-connected and most are attributable to OBC from the late 1940s to 1960. It is the early examples of weld-connected Warren trusses dating from the mid 1930s to mid 1940s that are the technologically significant examples.

Bridge Considered Historic By Survey: No

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