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Laroque Bridge

Addison County, Vermont

Photos 

1. View Down Roadway

Photo taken August 1990 by Bridge Hill Studio for the Historic American Engineering Record

View photos at Library of Congress

BH Photo #222481

Map 

Street View 

Description 

This bridge is typical of the engineering practice of the early 20th Century. By that time, two basic truss designs Warren and Pratt had replaced the variety of types which characterized the 19th Century. Riveted construction was almost universal. In the heaviness of its members and concrete slab floor, the bridge reflects the growing use of automobiles and trucks in the 1920s. This truss is identical to the standard bridges built in the late 1920s except that it uses built-up members instead of rolled I-beams. These members cost more but were lighter than equivalent rolled sections. Like most flood-era bridges, built in late 1920s it has a curved top chord. Though more costly to fabricate, curved chords saved money in heavy-service bridges like this relatively long and wide concrete decked span, since the truss has extra depth only in the middle where it was needed to counter bending forces. McClintic-Marshall Company was a Pennsylvania based fabricator which advertised heavily for New England business in the 1920s. This Company built the Bath bridge in Maine as well as four other Vermont bridges.

-- Historic American Engineering Record

Facts 

Overview
Lost pony truss bridge over New Haven River on VT 116 in Bristol
Location
Addison County, Vermont
Status
Bridge has been demolished and replaced with a 2 span steel stringer
History
Built 1925 by the McClintic-Marshall Co.; Damaged by flooding 2007 ; Demolished 2014
Builder
- McClintic-Marshall Co. of Chicago, Illinois & Pittsburgh, Pennsylvania
Design
Polygonal Warren pony truss
Dimensions
Length of largest span: 103.0 ft.
Total length: 107.0 ft.
Deck width: 18.7 ft.
Approximate latitude, longitude
+44.09749, -73.09348   (decimal degrees)
44°05'51" N, 73°05'37" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/652604/4884468 (zone/easting/northing)
Quadrangle map:
South Mountain
Average daily traffic (as of 2012)
2,600
Inventory number
BH 33923 (Bridgehunter.com ID)
Inspection report (as of May 2017)
Overall condition: Good
Superstructure condition rating: Very Good (8 out of 9)
Substructure condition rating: Very Good (8 out of 9)
Deck condition rating: Very Good (8 out of 9)
Sufficiency rating: 97 (out of 100)
View more at BridgeReports.com

Categories 

Addison County, Vermont (35)
Built 1925 (1,250)
Built during 1920s (9,702)
HAER documented (1,105)
Have street view (26,087)
Lost (23,411)
Lost 2014 (335)
Lost during 2010s (3,040)
McClintic-Marshall Co. (72)
Owned by state (15,513)
 Polygonal Warren pony truss (383)
Polygonal Warren truss (1,013)
Pony truss (15,896)
Replaced by new bridge (15,631)
Span length 100-125 feet (4,307)
Total length 100-125 feet (5,068)
Truss (31,949)
Vermont (576)
Warren truss (6,393)

Update Log 

  • September 29, 2014: Updated by Michael Quiet: Bridge has been demolished and replaced.
  • December 27, 2011: Photos imported by James Baughn
  • September 9, 2011: New Street View added by J.P.
  • September 15, 2006: Posted HAER photos

Sources 

  • J.P. - wildcatjon2000 [at] gmail [dot] com
  • HAER VT-21 - Laroque Bridge, Spanning New Haven River at State Route 116, Bristol, Addison County, VT
  • Michael Quiet - mquiet [at] gmail [dot] com
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Comments 

Laroque Bridge
Posted September 9, 2011, by J.P.

bridge has had a bailey truss inserted in side the trusses of the original bridge for support.