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OH-715 Walhonding River Bridge

OH-715 Walhonding River Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 11, 2015

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Key Facts

Facility Carried / Feature Intersected
OH-715 Over Walhonding River
Location
Rural: Coshocton County, Ohio: United States
Construction Date and Builder / Engineer
1914 By Builder/Contractor: Central Concrete and Construction Company of Canton, Ohio

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
203 Feet (62 Meters)
Structure Length
410 Feet (125 Meters)
Roadway Width
18 Feet (5.49 Meters)
Spans
2 Main Span(s)
NBI Number
1602888

Historic Significance Rating (HSR)

Bridge Documentation

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

This bridge has been bypassed and abandoned, but can still be walked on by visitors. It is a late example of its type, but pin-connected truss bridges, especially multi-span examples of any age are rare. This bridge is therefore historically significant. It is also noted for the lack of alteration.

This bridge is located on a part of the river that is close to the Mohawk Resevoir. As such, it appears that during high water events the water level can rise dramatically at this location. There is evidence that the water has at times reached as high as halfway up the height of the truss... a large tree trunk was stuck between a pair of eyebars near one of the intermediate connections of the truss! Some of the trees in the surrounding area also had flood debris stuck in them at a similar elevation.

Information and Findings From Ohio's Historic Bridge Inventory

Setting/Context

The bridge once carried a 2-lane state highway over a river in a rural, wooded setting. It has been bypassed by a modern road to the north, but it is accessible for pedestrian use. There is a parking area at the west end of the bridge, which is closed to traffic and bypassed, is located in a rural setting.

Physical Description

The 2 span, 406'-long, pin-connected Pennsylvania thru truss bridge has built-up compression members and eyebar tension members.

Integrity

Bypassed, ca. 2004 and left in place. The only observed change from the original design is the steel open grid deck.

Summary of Significance

"The 1914 pin-connected Pennsylvania thru truss bridge is a later but complete example of its type/design with typical period details. The bridge has been bypassed and left in place. There have been no significant changes to the integrity of design or materials since the prior inventory and the bridge was last field checked by ODOT in 2006. It is eligible from the prior ODOT inventory. The Pennsylvania truss type/design, also sometimes referred to as a Pettit truss, is a subdivided Pratt truss with polygonal upper chord that was developed in the 1870s for use as a long-span bridge with heavy locomotives. The Pennsylvania Railroad popularized the form (hence the name), and Henry Pettit, an engineer in the employ of the railroad, became associated with it. It was not, however, used exclusively by the Pennsylvania RR being a very popular railroad and later highway truss design. Lighter pin-connected Pennsylvania truss highway bridges were built from the 1880s to 1910s, and the design also made the transition to heavier, rivet-connected designs of the mid 20th century. The truss's main advantages are an economical use of material provided by the sloped upper chord and the added stiffness provided by the substruts and ties in longer spans. Span lengths of up to 300 ft. are not uncommon. Ohio has eight identified examples dating from 1888 to 1939. Post-1900 examples are less significant than earlier examples, but they may illustrate important refinements, such as the use of riveted connections or rolled section members."

Justification

The late example of a pin connected thru truss is one of 13 extant examples of bridges with polygonal upper chords and/or subdivided panels in the state that date from 1888 until 1923. It is of moderate significance given that the numbers in the population.

Bridge Considered Historic By Survey: Yes

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Maps and Links: OH-715 Walhonding River Bridge

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