U.S. Route 1 in New Hampshire

U.S. Route 1
Route information
Maintained by NHDOT
Length:	17.044 mi (27.430 km)
Existed:	1926 – present
Major junctions
South end:	US 1 in Salisbury, MA
	NH 101 in Hampton US 1 Byp. in Portsmouth
North end:	US 1 in Kittery, ME
Location
Counties:	Rockingham
Highway system
United States Numbered Highway System List Special Divided Replaced New Hampshire Highway System Interstate U.S. State Turnpikes ← I‑393 NH 1A → ← NH 1A US 2 →

U.S. Route 1 Bypass
Location:	Portsmouth
Length:	4.3 mi (6.9 km)

New Hampshire Route 1A
Location:	Seabrook-Portsmouth
Length:	18.32 mi (29.48 km)

New Hampshire Route 1B
Location:	Portsmouth
Length:	4.808 mi (7.738 km)

In the U.S. state of New Hampshire, U.S. Route 1 is a major north–south state highway through Hampton and Portsmouth. It lies between Interstate 95 and New Hampshire Route 1A.

The Memorial Bridge, which formerly carried US 1 over the Piscataqua River between New Hampshire and Maine, was closed to motorists in July 2011 due to numerous safety and structural concerns. This was a permanent closure following two instances in 2009 and 2010 when the bridge was closed for emergency repairs. The bridge was, however, left open to pedestrians and bicyclists, as it was the only of the three river bridges allowing for these methods of travel. On January 9, 2012, the bridge was closed to pedestrians and cyclists as well. The middle lift section was removed on February 8, leaving a 300 foot (91 m) gap in US 1.

Over the next two years, the bridge was demolished and removed, and a new drawbridge was constructed in its place. In the interim, access to US 1 on each side of the gap was facilitated by either the Sarah Mildred Long Bridge, which carries US 1 Bypass, or the Piscataqua River Bridge which carries I-95. The New Hampshire Department of Transportation operated hourly shuttle service between Portsmouth and Kittery while the new bridge was constructed.

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