page_title: U.S. Route 1 Bypass (Portsmouth, New Hampshire–Kittery, Maine)
section_title: New Hampshire
hierarchical_section_title: U.S. Route 1 Bypass (Portsmouth, New Hampshire–Kittery, Maine) / Route description / New Hampshire
caption_attribution_description: English: Photo of the Sarah Mildred Long Bridge, a lift bridge spanning the Piscataqua River between Portsmouth, New Hampshire, and Kittery, Maine, carrying traffic of U.S. Route 1 Bypass. This is the replacement bridge, which opened in March 2018. View from the New Hampshire side.
context_page_description: U.S. Route 1 Bypass is a 4.3-mile-long bypass of U.S. Route 1 in Portsmouth, New Hampshire and Kittery, Maine. Most of its north section, northeast of the Portsmouth Traffic Circle where it meets the Blue Star Turnpike and Spaulding Turnpike, is built to rudimentary freeway standards, with no cross traffic but driveway access. The southern portion is similarly constructed, although there are two four-way intersections with traffic lights just south of the circle and a third at its south end, just before intersecting with US 1.
context_section_description: US 1 Bypass begins at US 1 (Lafayette Road) south of downtown Portsmouth.  Formerly a half-interchange with limited access and a flyover ramp, the old interchange was converted to a standard three-way intersection with full access in 2013.  US 1 Bypass heads northwest and has two at-grade intersections with Borthwick Avenue and Coakley Road/Cottage Street before it comes to a large rotary, the Portsmouth Traffic Circle, where it interchanges with I-95 and the southern end of the Spaulding Turnpike/New Hampshire Route 16 (NH 16) and the eastern terminus of US 4. US 1 Bypass enters the circle from the southeast and leaves via the first exit, turning to the northeast towards Maine.
  Upon leaving the rotary, US 1 Bypass immediately interchanges with Woodbury Avenue, which provides access to downtown and directly serves the retail district of Newington.  The highway continues northeast, interchanging with Maplewood Avenue, and crossing over Market Street before reaching the Piscataqua River and crossing it on the Sarah Mildred Long Bridge.
caption: The Sarah Mildred Long Bridge (2018) carrying US 1 Byp. between New Hampshire and Maine
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