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Pembroke vicinity

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New River Bridge, Spanning New River at State Route 623, Pembroke, Giles County, VA



B&W Photos


Data Pages


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Item Title


Location
Spanning New River at State Route 623, Pembroke vicinity, VA

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Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER VA-68
Significance: The New River Bridge at Pembroke is unusual in its combination of various truss types and engineering details, many of which are unique in the area and survive only rarely statewide. Built in 1915-1916 by the Virginia Bridge and Iron Company of Roanoke, Virginia, it combines seven spans, six of which are carried by metal trusses of four different varieties. The bridge demonstrates the persistence of at least three early technological solutions generally abandoned by the turn of the century: nonriveted field constructions, the use of all pin connections (on the three main spans), and the incorporation of hand-forged welds and wrought iron for various structural members. Within the state, it contains the greatest number and variety of truss types for a given automotive crossing. Additionally, Virginia's longest Pennsylvania Petit through truss is found here, being the last of three bridges of this type to survive. Two other rare statewide features are metal column piers and a Pratt deck truss, the last of two to survive. The New River Bridge is nestled against Castle Rock, one of the most scenic natural formations in the region. The juxtaposition of technological and natural landmarks makes for a unique site.

Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. AERIAL VIEW, VIEW SOUTHWEST SHOWING CASTLE ROCK BEYOND
2. AERIAL VIEW, VIEW SOUTH OF BRIDGE
3. AERIAL VIEW, VIEW NORTHEAST
4. AERIAL VIEW, VIEW NORTH WITH CASTLE ROCK AND NORFOLK AND WESTERN RAILROAD TUNNEL IN FOREGROUND AND NEW RIVER BRIDGE IN BACKGROUND
5. VIEW NORTHEAST OF CASTLE ROCK AND NEW RIVER BRIDGE
6. VIEW NORTH OF PENNSYLVANIA PETIT TRUSSES
7. VIEW NORTH OF UNDERSIDE OF PRATT DECK TRUSS
8. VIEW SOUTH
9. VIEW SOUTH OF CAMELBACK SEEN THROUGH TRUSS
10. VIEW SOUTH OF PRATT PONY TRUSS
11. VIEW SOUTH OF PRATT PONY TRUSS
12. VIEW NORTHEAST ALONG BRIDGE DECK
13. VIEW SOUTHWEST ACROSS BRIDGE DECK WITH CASTLE ROCK IN BACKGROUND
14. VIEW NORTHEAST OF UNDERSIDE OF PENNSYLVANIA PETIT TRUSS, SHOWING SLEEPERS, TRANSVERSE BEAMS, AND CONCRETE PIERS
15. VIEW SOUTH OF CONCRETE PIER SUPPORTING CAMELBACK AND PENNSYLVANIA PETIT TRUSSES. ORIGINAL PIER LYING IN FOREGROUND DESTROYED BY 1915 FLOOD DURING ORIGINAL CONSTRUCTION
16. VIEW SOUTHWEST OF CONCRETE PIER SUPPORTING CAMELBACK AND PENNSYLVANIA PETIT TRUSSES. ORIGINAL PIER LYING IN FOREGROUND DESTROYED BY 1915 FLOOD DURING CONSTRUCTION
17. CONCRETE ABUTMENT AT EAST END OF BRIDGE, VIEW SOUTH
18. VIEW SOUTH OF CAMELBACK TRUSS SHOWING JOINT OF TRANSVERSE GIRDER AND INTERMEDIATE VERTICAL. NOTE ORIGINAL DIAGONALS. TIE RODS ARE MODERN ADDITION
19. VIEW SOUTHWEST OF INTERMEDIATE VERTICAL PENNSYLVANIA PETIT TRUSS WITH CASTLE ROCK IN BACKGROUND. JUNCTION OF INTERMEDIATE VERTICAL AND TOP CHORD WITH STABILIZING LATERAL STRUT ABOVE AND SWAY STRUT BELOW. ORIGINAL PAIRED DIAGONAL EYE BARS LATER REINFORCED WITH TIE ROD
20. PENNSYLVANIA PETIT TRUSS
21. JUNCTURE OF VERTICALS AND DIAGONALS ON PENNSYLVANIA PETIT TRUSS. TIE ROD WITH U BOLT LATER MODIFICATION
22. PIN CONNECTION AT JUNCTURE OF INTERMEDIATE VERTICAL WITH BOTTOM CHORD ON PENNSYLVANIA PETIT TRUSS. HYDRAULICALLY FORGED EYES ON ROLLED STOCK.
23. JUNCTION OF TOP CHORD AND INCLINED END POST, PRATT PONY TRUSS
24. PIN CONNECTION AT VERTICAL AND BOTTOM CHORD ON CAMELBACK THROUGH TRUSS. VERTICAL AND BOTTOM CHORD MADE OF HAND-FORGED EYE BARS
25. MANUFACTURERS PLAQUE, NORTHEAST FACE OF CAMELBACK


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