Bridgehunter.com | Laroque Bridge

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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

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: Truss bridge over New Haven River on VT 116 in Bristol
Location: Addison County, Vermont
Status: Open to traffic(?)
History: Built 1925 by the McClintic-Marshall Co.
Builder: - McClintic-Marshall Co. of Chicago, Illinois
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: +44.09833, -73.09500 (decimal degrees)
44°05'54" N, 73°05'42" W (degrees°minutes'seconds")
Approximate UTM coordinates: 18/652480/4884558 (zone/easting/northing)
USGS topographic map: South Mountain
Inventory number: BH 33923 (Bridgehunter.com ID)
Inspection (as of 04/2011): Deck condition rating: Serious (3 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 2.0 (out of 100)
Average daily traffic (as of 1998): 2,300

Update Log

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

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.