Tyngsborough Bridge, Steel tied-arch bridge in Tyngsborough, Massachusetts, US.
The Tyngsborough Bridge extends 656 feet across the Merrimack River, featuring a steel rib through arch design with a main span of 547 feet.
The Massachusetts Highway Department completed this bridge in 1930 to replace a wooden Whipple truss bridge that previously connected the river banks.
The bridge represents early 20th-century engineering methods and stands as one of the longest steel rib through arch spans in Massachusetts.
The structure carries Route 113 and accommodates over 22,000 vehicles daily, connecting the communities on both sides of the Merrimack River.
Following extensive repairs from 2009 to 2012, engineers incorporated modern structural improvements while maintaining the original three-hinged arch design.
Location: Massachusetts
Official opening: 1930
GPS coordinates: 42.67600,-71.42130
Latest update: March 5, 2025 23:00
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