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Stone Sign Post Road Bridge

Photos 

Photo taken by Andrew Pearce in September 2012

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BH Photo #239358

Map 

Description 

This is the 4th remaining bridge by builder J.W. Scott of Flemington NJ.

from the 2002 survey: "The 2-panel pony truss bridge is a hybrid modified Warren design with predominantly riveted connections. The reinforced floorbeam is suspended from a pin at the lower panel points. A non-functioning vertical rod extends from the pin and is secured to the top chord by a ball finial. The original lattice railings remain." "PHYSICAL DESCRIPTION: The two-panel, pin-connected slightly skewed Warren pony truss bridge has several unusual features. The top chord is a riveted box member consisting of angles and plate and a continuous cover plate, bent at the inclined end posts. Gusset plates secure the diagonals at the lower panel points. The bottom chord and diagonals are toe-in angles. The vertical member, a modification to the original design made after 1974, consists of two angles with a center separating batten and a central rod which threads through the top chord into a fastening finial. The bottom of the rod is a forged loop that passes around the pin that U hanger for the single flame-cut floor beam. The bridge is supported on random fieldstone abutments with wingwalls. The original medallion and lattice railing remains, but collision damage has buckled the east end post and railing. Concrete scour protection has been added, and a concrete toe wall has been added to the east abutment. Other minor repairs include welded reinforcing plates at the bottom of one inclined end post."

As of 2012, the redundant vertical made from 2 angles has been removed, leaving only the original redundant made from rod. Outriggers have been added, which may or may not be redundant. This bridge sees very little traffic and seems quite sturdy for its size.

Facts 

Overview
Pony truss bridge over Plum Brook on Stone Sign Post Road
Location
Hunterdon County, New Jersey
Status
Open to traffic
History
Built 1903; rehabilitated 2003
Builder
- J. W. Scott of Flemington, New Jersey
Design
Warren pony truss with alternating verticals
Dimensions
Length of largest span: 27.9 ft.
Total length: 29.9 ft.
Deck width: 15.4 ft.
Recognition
Posted to the National Register of Historic Places on October 4, 2016
Approximate latitude, longitude
+40.49028, -74.93833   (decimal degrees)
40°29'25" N, 74°56'18" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/505226/4482177 (zone/easting/northing)
Quadrangle map:
Stockton
Inventory numbers
NJ 100D390 (New Jersey bridge number)
NRHP 16000692 (National Register of Historic Places reference number)
BH 25319 (Bridgehunter.com ID)
Inspection (as of 05/2015)
Deck condition rating: Good (7 out of 9)
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 72.0 (out of 100)
Average daily traffic (as of 2015)
120

Update Log 

  • November 13, 2016: Updated by James Baughn: Bridge has been added to NRHP
  • September 15, 2012: Updated by Andrew Pearce: added description and pictures

Sources