U.S. Route 1 (US 1) is a north–south
U.S. Route
The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these h ...
is the
U.S. state
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...
of
New Hampshire
New Hampshire ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
through
Hampton
Hampton may refer to:
Places Australia
*Hampton bioregion, an IBRA biogeographic region in Western Australia
* Hampton, New South Wales
*Hampton, Queensland, a town in the Toowoomba Region
* Hampton, Victoria
** Hampton railway station, Melbour ...
and
Portsmouth
Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
. It lies between
Interstate 95 (I-95) and
New Hampshire Route 1A
New Hampshire Route 1A is an long state highway located in southeast New Hampshire. The route runs along the Atlantic coastline from the Massachusetts border north to Rye, then turns toward downtown Portsmouth. The southern terminus is at the Ma ...
(NH 1A).
Route description
US 1 begins in
Seabrook at the border with
Salisbury, Massachusetts
Salisbury is a small coastal beach town and summer tourist destination in Essex County, Massachusetts, United States. The community is a popular summer resort beach town situated on the Atlantic Ocean, north of Boston on the New Hampshire borde ...
. The route closely parallels I-95 along Lafayette Road for a majority of its stretch in the state. US 1 travels through Hampton,
North Hampton, and finally enters Portsmouth. The main route turns into downtown while
US 1 Bypass (US 1 Byp.) travels toward I-95 and the Spaulding Turnpike made up of
US 4 and
NH 16 in the general direction toward
Concord
Concord may refer to:
Meaning "agreement"
* Harmony, in music
* Agreement (linguistics), a change in the form of a word depending on grammatical features of other words
Arts and media
* ''Concord'' (video game), a defunct 2024 first-person sh ...
and the
Lakes Region/
White Mountains. US 1 Byp. terminates at US 1 in
Kittery, Maine
Kittery is a town in York County, Maine, United States, and the oldest incorporated town in Maine. Home to the Portsmouth Naval Shipyard on Seavey's Island, Kittery includes Badger's Island, the seaside district of Kittery Point, and part of ...
, at a rotary intersection with
State Route 236 and I-95 with connections to the Maine Turnpike toward
Portland
Portland most commonly refers to:
*Portland, Oregon, the most populous city in the U.S. state of Oregon
*Portland, Maine, the most populous city in the U.S. state of Maine
*Isle of Portland, a tied island in the English Channel
Portland may also r ...
. US 1 travels down State Street going toward Maine and Market Street into Portsmouth.
History
US 1 follows the historic Lafayette Road through New Hampshire, named after the
Gilbert du Motier, Marquis de Lafayette
Marie-Joseph Paul Yves Roch Gilbert du Motier de La Fayette, Marquis de La Fayette (; 6 September 1757 – 20 May 1834), known in the United States as Lafayette (), was a French military officer and politician who volunteered to join the Conti ...
, who passed over the road in 1825.

For a period of time during the 1950s, a segment of US 1 in Massachusetts and New Hampshire was routed onto what later became
I-95
Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...
. Roadway that had been US 1 was designated as
Route 17 from
Danvers to
Salisbury
Salisbury ( , ) is a city status in the United Kingdom, cathedral city and civil parish in Wiltshire, England with a population of 41,820, at the confluence of the rivers River Avon, Hampshire, Avon, River Nadder, Nadder and River Bourne, Wi ...
and NH 17 for a short distance in
Seabrook.
Once the I-95 designation was adopted, Route 17 and NH 17 were restored to being US 1.
Memorial Bridge replacement
The original
Memorial Bridge, which formerly carried US 1 over the
Piscataqua River
The Piscataqua River (Abenaki language, Abenaki: ''Pskehtekwis'') is a tidal river forming the boundary of the U.S. states of New Hampshire and Maine from its origin at the confluence of the Salmon Falls River and Cochecho River to the Atlant ...
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 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
The Sarah Mildred Long Bridge is a lift bridge spanning the Piscataqua River between Portsmouth, New Hampshire, and Kittery, Maine, carrying traffic of U.S. Route 1 Bypass. An original bridge by the same name was in operation from 1940 until 2 ...
, which carries
US 1 Byp., or the
Piscataqua River Bridge
The Piscataqua River Bridge is a through arch bridge that crosses the Piscataqua River, connecting Portsmouth, New Hampshire with Kittery, Maine, United States. Carrying six lanes of Interstate 95, the bridge is the third modern span and first f ...
which carries
I-95
Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...
. The
New Hampshire Department of Transportation
The New Hampshire Department of Transportation (NHDOT) is a government agency of the U.S. state of New Hampshire. The Commissioner of NHDOT is Victoria Sheehan. The main office of the NHDOT is located in the J. O. Morton Building in Concord, N ...
operated hourly shuttle service between Portsmouth and Kittery while the new bridge was constructed.
The new bridge was officially dedicated at a ceremony on the New Hampshire side of the span just before noon on August 8, 2013. Former Portsmouth Mayor
Eileen Foley
Helen "Eileen" Foley ( Dondero; February 27, 1918 – February 22, 2016) was an American politician. Foley served as the Mayor of Portsmouth, New Hampshire, eight terms from 1968–1971, 1984–1985, and 1988–1997. She remains the longest-servi ...
cut the red ribbon, 90 years after she performed the same honors for the original span in 1923 when she was five years old.
The bridge initially opened to only pedestrians and bicyclists. The new bridge—constructed over two previously existing piers—opened to vehicular traffic at 2:00 pm first with southbound traffic (Maine to New Hampshire), then northbound. Finishing work on the bridge was completed in late 2013.
Major intersections
Auxiliary routes
U.S. Route 1 Bypass
U.S. Route 1 Bypass (US 1 Byp.) is a bypass of US 1 in Portsmouth and
Kittery, Maine
Kittery is a town in York County, Maine, United States, and the oldest incorporated town in Maine. Home to the Portsmouth Naval Shipyard on Seavey's Island, Kittery includes Badger's Island, the seaside district of Kittery Point, and part of ...
. The route runs for in New Hampshire and is mostly a four-lane divided semi-limited-access freeway, although two four-way traffic signals are present south of the Portsmouth traffic circle. The southern terminus is at US 1 (Lafayette Road) just south of downtown. The highway continues northwest to the traffic circle, where it then turns northeast. US 1 Byp. crosses the
Sarah Mildred Long Bridge
The Sarah Mildred Long Bridge is a lift bridge spanning the Piscataqua River between Portsmouth, New Hampshire, and Kittery, Maine, carrying traffic of U.S. Route 1 Bypass. An original bridge by the same name was in operation from 1940 until 2 ...
and continues into
Kittery, Maine
Kittery is a town in York County, Maine, United States, and the oldest incorporated town in Maine. Home to the Portsmouth Naval Shipyard on Seavey's Island, Kittery includes Badger's Island, the seaside district of Kittery Point, and part of ...
.
New Hampshire Route 1A
New Hampshire Route 1A (NH 1A) is an auxiliary of US 1 which runs along the
Atlantic
The Atlantic Ocean is the second largest of the world's five oceanic divisions, with an area of about . It covers approximately 17% of Earth's surface and about 24% of its water surface area. During the Age of Discovery, it was known for se ...
coastline
A coast (coastline, shoreline, seashore) is the land next to the sea or the line that forms the boundary between the land and the ocean or a lake. Coasts are influenced by the topography of the surrounding landscape and by aquatic erosion, su ...
. It runs from the
Massachusetts
Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...
border north to
Rye
Rye (''Secale cereale'') is a grass grown extensively as a grain, a cover crop and a forage crop. It is grown principally in an area from Eastern and Northern Europe into Russia. It is much more tolerant of cold weather and poor soil than o ...
, then turns toward downtown
Portsmouth
Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
. The southern terminus of NH 1A is at the state line in
Seabrook where it continues south as
Route 1A. The northern terminus is at the junction with US 1 (Lafayette Road) in Portsmouth. For the length of the road’s run along the shore, its local name is Ocean Boulevard. In Portsmouth, it is known as Miller Avenue and Sagamore Avenue.
New Hampshire Route 1B
New Hampshire Route 1B (NH 1B) is a auxiliary of US 1 serving the town of
New Castle.
The southern terminus is at
NH 1A in
Portsmouth
Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
, near the city's southeastern boundary. The road loops around over Great Island in the
Piscataqua River
The Piscataqua River (Abenaki language, Abenaki: ''Pskehtekwis'') is a tidal river forming the boundary of the U.S. states of New Hampshire and Maine from its origin at the confluence of the Salmon Falls River and Cochecho River to the Atlant ...
through New Castle and then back into downtown Portsmouth. The northern terminus is at the junction with US 1 at
Prescott Park, near the
Maine
Maine ( ) is a U.S. state, state in the New England region of the United States, and the northeasternmost state in the Contiguous United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and ...
state line. The highway is signed north–south but forms a half-loop for most of its route.
Due to US 1 being routed onto the
Memorial Bridge adjacent to the intersection with NH 1B, traffic from NH 1B must loop around State Street and Harbor Place to access US 1 in either direction. Harbor Place defaults onto Daniel Street, which carries US 1 south into Market Square. A hard left onto Wight Avenue will cross over to US 1 north to
Maine
Maine ( ) is a U.S. state, state in the New England region of the United States, and the northeasternmost state in the Contiguous United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and ...
. Southbound traffic on US 1 must use Chapel and State streets to access NH 1B.
Junction list
See also
Related routes
*
U.S. Route 1 Bypass, a mostly-
freeway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms ...
bypass of downtown Portsmouth
*
New England Interstate Route 1
,
,
,
,
,
The New England road marking system was a regional system of marked numbered routes in the six-state region of New England in the United States. The routes were marked by a yellow rectangular sign with black numbers and border. M ...
, the designation of US 1 prior to 1926
References
External links
U.S. Route 1 in New Hampshireon
Flickr
Flickr ( ) is an image hosting service, image and Online video platform, video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was previously a co ...
U.S. Route 1 Bypasson Flickr
New Hampshire State Route 1Aon Flickr
New Hampshire State Route 1Bon Flickr
{{DEFAULTSORT:U.S. Route 01 in New Hampshire
01
1 New Hampshire
Transportation in Rockingham County, New Hampshire