This bridge is overall a traditional Pratt truss, yet is also noted for a couple unusual details. The portal bracing is lightweight, and the same design as the struts, being composed of a small strip of plate riveted to angle. Some of the rivets on the bridge are not the typical round head, and are instead steeple head or cone head type. A few other bridges in western New Jersey have these details, and may all be the work of the same builder.
There is another interesting rivet-related observation to be made on this bridge. Looking at the rivets which connect plate to the rolled i-beams on the vertical members, you may note than some of those rivets have deformed heads. The location of these rivets on beam flanges would have made them difficult to drive, accounting for the deformed appearance. The interior rivet heads could not be held in place or driven head-on because of the other beam flange being in the way.
Information and Findings From New Jersey's Historic Bridge Inventory
Discussion of Bridge
The 6-panel Pratt thru truss bridge is pin connected. The connections were reinforced with welded plates in 1976. It is supported on random ashlar abutments and wingwalls. Other alterations include reinforcements on floorbeams, top struts and knee braces, added diagonal end posts, metal pan deck and guiderail. One of ten Pratt thru-truss bridges in the county, the many alterations have compromised the design integrity and historical significance of the bridge.
Discussion of Surrounding Area
The single span single lane thru truss bridge carries Cider Mill Road (Reaville-Clover Hill, CR 29) over the Neshanic River. It is located in a pastoral setting of open fields, farm buildings, corn fields and scattered trees. It carries a lightly traveled country road.
Bridge Considered Historic By Survey: No
Coordinates (Latitude, Longitude):
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