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Main Street Bridge

Photo 

MBTA - Main Street Bridge - S Acton

Photo from old postcard

Enlarge

BH Photo #466731

Map 

Description 

"A relatively late example of the commonest metal truss bridge sub-type found in Massachusetts the rivetted Warren pony truss. Approximately 225 metal truss bridges of all types (not counting bridges which use metal trusses only in approach spans) have been identified to date in the MDPW statewide computer print-out. Of the 108 examples whose sub-types have been catalogued to date, 15 are deck trusses, 24 are through trusses, and 69 are pony trusses. 51 of the 70 pony trussess are Warrens and all 51 are rivetted. Built by an important and extremely prolific Massachusetts bridge-building company (47 surviving Boston Bridge Works bridges are currently listed in the statewide builders' and designers' index) but not a particularly early or important example of their work." - S.J. Roper, 10/17/1984

Facts 

Overview
Pony truss bridge over MBTA on Main Street SR 27
Location
South Acton, Middlesex County, Massachusetts
Status
Replaced by a new bridge
History
Built 1906; replaced 1997
Builder
- Boston Bridge Works of Boston, Massachusetts
Railroads
- Boston & Maine Railroad (B&M; BM)
- Massachusetts Bay Transportation Authority (MBTA)
Design
Warren pony truss with all verticals
Dimensions
Length of largest span: 86.9 ft.
Total length: 89.9 ft.
Deck width: 52.0 ft.
Approximate latitude, longitude
+42.45998, -71.45448   (decimal degrees)
42°27'36" N, 71°27'16" W   (degrees°minutes'seconds")
Approximate UTM coordinates
19/298190/4703768 (zone/easting/northing)
Inventory number
BH 88408 (Bridgehunter.com ID)

Update Log 

  • May 21, 2020: Updated by Ian Martin: Merged MACRIS Database info; bridge has been replaced
  • March 2, 2020: New photo from Geoff Hubbs

Sources