Tyngsborough Bridge

Tyngsborough Bridge
The arch bridge in Tyngsborough, Massachusetts, with the Temporary bridge alongside it in 2006
The arch bridge in Tyngsborough, Massachusetts, with the Temporary bridge alongside it in 2006
Coordinates42°40′34″N 71°25′17″W / 42.67605°N 71.42133°W / 42.67605; -71.42133
CrossesMerrimack River
LocaleTyngsborough, Massachusetts
Official nameTyngsborough Bridge
OwnerMassachusetts Highway Department
Preceded byWhipple Truss Bridge
Characteristics
DesignTied-arch bridge
MaterialSteel
Total length656 feet (200 m)
Width41.5 feet (12.6 m)
Longest span547 feet (167 m)
No. of spans1
Piers in water0
Load limitM 18
History
DesignerMassHighway in-house Design Unit
Constructed bySimpson Bros. Corporation[1]
Boston Bridge Works[2]
Opened1930
Rebuilt1975
Statistics
Daily traffic22,300 (2007)
Location
Map

The Tyngsborough Bridge is a steel tied-arch bridge located in Tyngsborough, Massachusetts and carries Route 113 over the Merrimack River. With a span of 547 feet, it has the longest span of any steel rib through arch bridges in Massachusetts. It is also the 2nd oldest steel rib through arch bridge in the state. The bridge is center hinged and features pratt-type trussing.[3][4]

  1. ^ Building and Engineering Trades Reference Book of Massachusetts and Rhode Island. Boston: F.W. Dodge. 1904. pp. 270–1. Retrieved 29 August 2017. Advertisement appears between pages 270 and 271.
  2. ^ Galer, Gregory Jay (1989). The Boston Bridge Works and the Evolution of Truss Building Technology. Brown University Press.
  3. ^ "Massachusetts Cultural Resource Information System". Massachusetts Department of Transport Highway Division. Retrieved 22 June 2015.
  4. ^ "National Bridges Entry". National Bridges. National Bridges. Retrieved 22 June 2015.