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Rockville Mt. Nebo Road Bridge

Rockville Mt. Nebo Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: July 6, 2014

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Key Facts

Facility Carried / Feature Intersected
Rockville - Mt. Nebo Road (CR-14) Over Big Sandy Creek
Location
Rural: Preston County, West Virginia: United States
Structure Type
Metal 5 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Metal 4 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed
Construction Date and Builder / Engineer
1893 By Builder/Contractor: King Bridge Company of Cleveland, Ohio

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
85 Feet (26 Meters)
Structure Length
149 Feet (46 Meters)
Roadway Width
11.2 Feet (3.41 Meters)
Spans
1 Main Span(s) and 1 Approach Span(s)
NBI Number
39A040

Historic Significance Rating (HSR)

Bridge Documentation

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

This attractive bridge is an excellent example of a bridge built by the King Bridge Company. Its combination design, featuring a through and pony truss span allows not only for a technological comparison of two types of truss bridge, but also for a comparison between bridge products offered by the prominent King Bridge Company. The through truss span features a decorative portal bracing knee including star cutouts... a distinctive detail of its builder. The use of lacing instead of cover plate on the end post and top chord is unusual, however. In contrast, the pony truss span uses cover plate for these parts. Another oddity is that the floor beams on the through truss span have been replaced, while the floor beams on the pony truss are original. The original floor beams are attractive built-up fishbelly style floor beams.

Sadly, this bridge suffers from severe deterioration in the form of widespread areas of complete section loss. Plate and angle on the bridge are particularly hard-hit, including around the top chord connections, which is unusual since the worst deterioration on a truss bridge is usually in the "splash zone" around the bottom chord. Moreover, the fact that this bridge is not near where winter deicing salt would be used makes the deterioration even more unusual. It seems likely that the deteriorated elements are steel rather than wrought iron. Wrought iron is resistant to corrosion in the absence of paint, but steel is much less so.

The road leading to this bridge is completely unimproved, composed of large boulders, and must be driven with great care. Anyone without familiarity with this road and area (and West Virginia in general) is recommended to utilize a vehicle with decent ground clearance and only attempt to access the bridge when the road is dry. The road is composed of large boulders and a car driving the road must be driven at the speed of a slow walk, and the sensation to the driver will be that of being in a boat on rough waters. Approach this bridge from the south.

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Photo Galleries and Videos: Rockville Mt. Nebo Road Bridge

 
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Maps and Links: Rockville Mt. Nebo Road Bridge

The road leading to this bridge is completely unimproved, composed of large boulders, and must be driven with great care.

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