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Green Hill Road Bridge

Green Hill Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 6, 2013

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Key Facts

Facility Carried / Feature Intersected
Green Hill Road Over Ashtabula River
Location
Rural: Ashtabula County, Ohio: United States
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1962
Main Span Length
98 Feet (30 Meters)
Structure Length
104 Feet (32 Meters)
Roadway Width
16 Feet (4.88 Meters)
Spans
1 Main Span(s)
NBI Number
433144

Historic Significance Rating (HSR)

Bridge Documentation

This bridge is an attractive example of a polygonal Warren pony truss. It is known known when it was originally built, or who the builder was. It was moved to this location in 1962. It is unknown where it originally came from. The bridge trusses appear to retain good integrity and are in good condition. It is hoped that this bridge will be maintained and preserved, however historic bridges that are not covered bridges have a questionable future in Ashtabula County. Some bridges have been preserved, and others have not. Some of the historic bridges that have been demolished in this county were, like this bridge, in decent condition and feasible to rehabilitate.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge carries a 1 lane road over a stream in a sparsely developed, rural setting.

Physical Description

The 1 span, 104'-long, rivet-connected Warren pony truss bridge has polygonal upper chord and verticals. All members are built-up. It has lattice railings.

Integrity

Relocated here in 1962.

Summary of Significance

The rivet-connected Warren pony truss dates ca. 1920 by style. It is a complete example of a common type/design. There has been no significant change in the bridge's status since it was elevated to the reserve pool in 1995, but it has no technologically distinguishing features and its original date of construction/builder are undocumented. There are many more distinguished and earlier examples that better represent the significance and contributions of this bridge type/design to the development of Ohio's road systems. 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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Photo Galleries and Videos: Green Hill Road Bridge

 
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CarCam: Westbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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Maps and Links: Green Hill Road Bridge

Coordinates (Latitude, Longitude):
41.852540,-80.727410

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