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Foundry Road Bridge

Photos 

Foundry Road Bridge

Western approach

Photo taken by Michael Quiet in September 2015

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BH Photo #337423

Map 

Description 

This remarkable wrought iron pony truss stands as Vermont's oldest metal highway bridge that still serves vehicular traffic in a unaltered state. While there are older extant examples such as the Elm Street Bridge in Woodstock (1870 Parker patent pony truss), these have been modified with load bearing stringers. Aside from this fact, the bridge has several other noteworthy features that contribute to its historical significance.

The first point to note is the fabricator of this bridge: The Vermont Construction Company of St. Albans, VT. This bridge is one of only 3 remaining examples from this small company, and is the oldest of them. Many more examples of bridges were fabricated by this company in the last 2 decades of the 19th century, but they never commanded a large market share during their time, making them uncommon even while in production.

The second point would be the construction method: This is a riveted truss bridge, making it among the older examples of a bridge that employed this construction method. While not the oldest, it is still very significant as a early example, and reflects the innovative nature of the Vermont Construction Company.

Of note, although not as significant, are some of the details of the bridge. The upper chord (except for the endposts) are open built up box members, with the top being comprised of x lacing, and the bottom being battens built into the box member (as opposed to resting outside of it). The vertical compression members are tapered web posts, as opposed to a more common parallel configuration.

The bridge underwent an extensive reconstruction in 2010. The lower chord and floorbeams received the most amount of work, with a significant amount of the original rivets being replaced with bolts. However the trusses themselves had no rivet replacement, meaning that the easily visible part of the bridge retains an exceptional amount of historical integrity.

Facts 

Overview
Warren pony truss bridge over First Branch White River on C3025 in Tunbridge
Location
Tunbridge, Orange County, Vermont
Status
Open to traffic
History
Built 1889 by Vermont Construction Co., rehabilitated 2010
Builder
- Vermont Construction Co. of St. Albans, Vermont
Design
Warren pony truss with alternating verticals
Dimensions
Length of largest span: 71.9 ft.
Total length: 74.2 ft.
Deck width: 11.5 ft.
Recognition
Eligible for the National Register of Historic Places
Also called
First Branch White River Bridge
Approximate latitude, longitude
+43.91462, -72.47679   (decimal degrees)
43°54'53" N, 72°28'36" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/702588/4865484 (zone/easting/northing)
Quadrangle map:
Chelsea
Average daily traffic (as of 2009)
30
Inventory number
BH 33988 (Bridgehunter.com ID)
Inspection report (as of November 2017)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 51.7 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 9, 2015: Updated by Michael Quiet: Added categories "Riveted", "Wrought Iron", Added pictures and info
  • June 20, 2014: Updated by Clark Vance: Corrected type, added history

Sources