US 3

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Baker River Bridge (Grafton County, New Hampshire)
Built 1930
Through truss bridge over Baker River on US 3 in Plymouth
Open to traffic

Concord River Bridge (Middlesex County, Massachusetts)
Built 1953
Pair of concrete arch bridges over Concord River on US 3 in Billerica
Replaced by a new bridge

Glove Hollow Brook Bridge (Grafton County, New Hampshire)
Built 1900; rehabilitated 1970
Concrete arch bridge over Glove Hollow Brook on US 3/NH 25 in Plymouth
Open to traffic

Harvard Brook Bridge (Grafton County, New Hampshire)
Built 1930; rehabilitated 2002
Concrete arch bridge over Harvard Brook on US 3 in Lincoln
Open to traffic

Lost River Bridge (Grafton County, New Hampshire)
Built 1931
Concrete arch bridge over Lost River on US 3 in Woodstock
Open to traffic

Merrimack River Bridge (Hillsborough County, New Hampshire)
Built 1923; rehabilitated 1995
Deck truss bridge over Merrimack River on US 3/NH 3A in Manchester
Open to traffic

Paugus Bay Bridge (Belknap County, New Hampshire)
Built 1933
Concrete arch bridge over Weirs Channel on US 3 in Laconia
Open to traffic

Pemigewasset River Bridge (Grafton County, New Hampshire)
Built 1937; rehabilitated 1987
Deck truss bridge over Pemigewasset River on US 3 in Ashland
Open to traffic

Souhegan River Bridge (Hillsborough County, New Hampshire)
Built 1921; rehabilitated 1934
Stone arch bridge over Souhegan River on US 3 in Merrimack
Open to traffic

Suncook River Bridge (Merrimack County, New Hampshire)
Built 1931; replaced 2007
Lost deck truss bridge over Suncook River on US 3 in Allenstown
Replaced by similar double-decker truss bridge