Tyngsborough Bridge, Steel tied-arch bridge in Tyngsborough, Massachusetts, US.
Tyngsborough Bridge is a steel arch bridge spanning the Merrimack River in Massachusetts with a main arch section and supporting girders. The structure crosses the waterway with a single large opening and carries the local road network connecting the towns on either side.
The bridge was completed in 1930 to replace an older wooden bridge that had served the crossing before. Major renovations between 2009 and 2012 reinforced the structure while preserving its original arch design.
The bridge represents early 20th-century engineering methods and stands as one of the longest steel rib through arch spans in Massachusetts.
The bridge is accessible year-round and handles regular traffic throughout the day. Pedestrians can use the crossing, though it is busiest during morning and evening commute hours.
Following extensive repairs from 2009 to 2012, engineers incorporated modern structural improvements while maintaining the original three-hinged arch design.
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