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Pompey Road Bridge

   


Pompey Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 11, 2012
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Key Facts

Facility Carried / Feature Intersected
Pompey Road (TR-166) Over Turkey Run
Location
Rural: Morrow County, Ohio
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1962
Main Span Length
44 Feet (13.4 Meters)
Structure Length
47 Feet (14.3 Meters)
Roadway Width
13.8 Feet (4.2 Meters)
Spans
1 Main Span(s)
NBI Number
5932238

Historic Significance Rating (HSR)

Bridge Documentation

This Bridge's Future Is At Risk!

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

This is a short pin-connected pony truss. During the 2012 HistoricBridges.org visit, the bridge was found to have a new deck including new steel deck stringers. Also, supplemental rods were bolted to the vertical members. The work looked very recent in 2012, and the timber was dated 2010-2011.

The supplemental rods added to the bridge did not extensively alter the bridge, since the original vertical members remain in place alongside the rods. The alteration is also reversible, which means it could be removed at a later date. The only irreversible aspect of these rods is that holes were drilled in the cover plate. The supplemental rods added to the bridge would have been an inexpensive way to avoid demolition and replacement and increase the service life of the bridge. However this type of repair did not improve the condition of any of the original bridge material. If additional money becomes available, Morrow County could rehabilitate the bridge by repairing the original bridge material. This bridge could likely be rehabilitated to like-new condition for much less than it would cost to demolish and replace the bridge.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge carries a 1 lane, rural road over a stream in a rural area of active farms and modern houses. Posted 6 tons.

Physical Description

The 1 span, 47'-long, pin-connected Pratt pony truss bridge is supported on ashlar abutments. The truss lines are traditionally composed with box section for the upper chords and inclined end posts and eye bars for the diagonals and lower chords. The verticals are toe-out channels with lacing. Field splices are bolted

Integrity

Welded repairs; impacted rust. Impact damage.

Summary of Significance

The date of construction of the ca. 1890 pin connected Pratt pony truss bridge is not documented in Morrow County records, but stylistically it represents the standardization of design typical of ca. 1890 and later bridges. It is one of 20 examples of the important bridge type in Morrow County with the oldest extant example dating to 1874. Many are undocumented and represent the era of standardization. Morrow County retains many deteriorating pin connected truss bridges largely because of the economic issues associated with there replacement in a largely rural county with no industrial tax base. This example is not historically or technologically significant.

Pratt trusses were undoubtedly the most popular truss design of the last quarter of the 19th century and continued to be built into the 20th century. The design, which initially was a combination of wood compression and iron tension members, was patented in 1844 by Thomas & Caleb Pratt. The great advantage of the Pratt over other designs was the relative ease of calculating the distribution of stresses. More significantly, it translated well into an all-metal design in lengths of less than 200'. Prior to about 1890, a variety of panel point connections (including bolts, cast-iron pieces, and pins), end panel floorbeam connections, and lower chord designs were in widespread use. Many of the connection details were proprietary and associated with individual builders or companies, and thus earlier examples are generally taken to be technologically significant in showing the evolution of the design. Post-1890 Pratt trusses show a progression toward less variation in their details such that by 1895 the design was quite formulaic with few significant differences between the designs of various builders. This marked the end of the pin-connected Pratt's technological evolution and, in fact, it was soon eclipsed in the highway bridge market by more rigid, rivet-connected truss designs, particularly the Warren design, but also the Pratt design as well. The transition to riveted field connections, which happened even earlier with railroads than highways, was in no small part due to concerns about stress reversals at the pins under heavier loads and improvements in pneumatic field riveting equipment in the early 1900s. In Ohio, there are 185 Pratt trusses dating from ca. 1874 to 1945 with at least 60 dating prior to 1900 (Phase 1A, 2008). The technologically significant unaltered examples of pin-connected Pratt trusses for the most part date prior to 1894 and have documented or attributed builders and dates of construction and/or significant connection or member details. Post-1895 examples are less technologically significant.

Bridge Considered Historic By Survey: No

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Photos and Videos: Pompey Road Bridge

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