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.
The Tyngsborough Bridge was constructed in 1931 to replace the wooden Whipple truss bridge. The new bridge was sited alongside but not parallel to the older, starting close the old structure on the eastern side of the river but reaching the western side well both of the old bridge. The Tyngsborough Bridge shares its open, braced rib design with the Boston University Bridge.
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