5 votes

Tyngsborough Bridge


Tyngborough Bridge

Photo taken by C Hanchey in August 2013

License: Creative Commons Attribution-NonCommercial (CC BY-NC)


BH Photo #273721

Street View 


Steel through arch bridge over Merrimack River on MA 113/MA 3A in Tyngsborough
Tyngsborough, Middlesex County, Massachusetts
Open to traffic
Built 1931 by the Boston Bridge Works; rehabilitated 1975 and 2012
- Boston Bridge Works of Boston, Massachusetts
Steel through arch
Length of largest span: 546.9 ft.
Total length: 566.0 ft.
Deck width: 29.9 ft.
Vertical clearance above deck: 12.2 ft.
Eligible for the National Register of Historic Places
Also called
Merrimack River Bridge
Approximate latitude, longitude
+42.67604, -71.42122   (decimal degrees)
42°40'34" N, 71°25'16" W   (degrees°minutes'seconds")
Approximate UTM coordinates
19/301611/4727682 (zone/easting/northing)
Quadrangle map:
Nashua South
Average daily traffic (as of 2017)
Inventory numbers
MA T09001 (Massachusetts bridge number)
BH 19383 (Bridgehunter.com ID)
Inspection report (as of July 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 52 (out of 100)
View more at BridgeReports.com

Update Log 

  • July 27, 2020: New photos from Nick Boppel
  • April 9, 2018: New Street View added by Amanda
  • August 10, 2016: Updated by Christopher Finigan: Added category "Riveted"
  • July 14, 2011: New Street View added by Clark Vance

Related Bridges 



Merrimack River Bridge
Posted October 17, 2013, by Tony Dillon (spansaver [at] hotmail [dot] com)

That's a beauty!

Merrimack River Bridge
Posted October 17, 2013, by L D (L [dot] da at gmailcom)

This bridge has undergone a rehabilitation and is now open to traffic again

Merrimack River Bridge
Posted July 14, 2011, by Clark Vance (cvance [at] dogmail [dot] com)

The street view is from a parallel span the looks like it might be a Bailey Truss. Is this parallel bridge temporary for the rehab period or is it there to add lanes at the crossing? Anyone know the story here?

Merrimack River Bridge
Posted July 14, 2011, by john foley (Jcfgrr [at] yahoo [dot] com)

Bridge is presently closed to traffic and under going a complete structural rebuild. All the defective steel is being replaced and the bridge will be repainted.

Also the approches are being redesigned for beter

traffic flow.