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| U.S. Route 1 Bypass (New Hampshire) | |
|---|---|
| State | NH |
| Type | US |
| Route | 1 Bypass |
| Length mi | 3.4 |
| Established | 1956 |
| Direction a | South |
| Terminus a | Portsmouth |
| Direction b | North |
| Terminus b | Kittery |
| Counties | Rockingham County |
U.S. Route 1 Bypass (New Hampshire) is a short arterial bypass of U.S. Route 1 serving the Seacoast Region around Portsmouth and adjacent to Kittery. The roadway connects multiple state and federal corridors and interfaces with local streets near the Piscataqua River and the Portsmouth Naval Shipyard. Its alignment supports commuter, freight, and seasonal traffic for the Seacoast Transportation Corridor.
The bypass begins near the intersection with U.S. Route 1 and New Hampshire Route 1B in Portsmouth, threading northward alongside the Bay of Fundy-influenced Piscataqua River and adjoining Strawbery Banke historic districts. It crosses municipal boundaries adjacent to Newington, New Hampshire and provides direct access to the Portsmouth International Airport at Pease and the Pease Air National Guard Base via interchanges that connect to New Hampshire Route 16 and local arterials. Along its course the bypass parallels the Maine–New Hampshire border and terminates near the approach to the Sarah Mildred Long Bridge, linking to Interstate 95 and the Maine Turnpike system. Roadside amenities include proximity to Wentworth by the Sea, Portsmouth Harbor Lighthouse, and industrial facilities tied to the Portsmouth Naval Shipyard and Maine Ports Authority logistics nodes.
The bypass was planned in the mid-20th century to relieve congestion on U.S. Route 1 through Market Square amid postwar growth associated with the Pease Air Force Base expansion and Cold War-era transport demands. Federal aid from the Federal-Aid Highway Act of 1956 contributed to construction, with design informed by standards from the American Association of State Highway and Transportation Officials. Early alignments required coordination with the New Hampshire Department of Transportation and property owners from Portsmouth to Kittery, Maine, and environmental reviews considered impacts to the Great Bay Estuary and nearby Hampton Beach State Park. Subsequent decades saw improvements responding to traffic stemming from tourism tied to the Freedom Trail-adjacent historic sites, commercial development near Pease International Tradeport, and regional freight movements connected to the New England states.
Major intersections include the southern junction with U.S. Route 1 near Woodbury Avenue and connection ramps to New Hampshire Route 1B; interchange access to New Hampshire Route 16 providing regional access to Concord and White Mountains destinations; the Pease area links serving Portsmouth International Airport at Pease and the Pease International Tradeport logistics complex; and the northern linkage approaching the Sarah Mildred Long Bridge and Interstate 95/Maine Turnpike corridors facilitating interstate travel toward Portland and Boston. Auxiliary connections also serve local thoroughfares leading to Strawbery Banke Museum, Prescott Park, and municipal facilities in Portsmouth.
Traffic volumes vary seasonally, reflecting tourist influxes bound for Seacoast attractions such as Odiorne Point State Park and the historic districts of Portsmouth, as well as commuter peaks tied to employment at the Pease International Tradeport and the Portsmouth Naval Shipyard. Freight traffic uses the bypass as part of truck routes connecting to the Maine Ports Authority and regional distribution centers in New England. Traffic monitoring by the New Hampshire Department of Transportation and regional planning bodies such as the Seacoast MPO measures vehicle counts and crash data, informing safety programs influenced by standards from the National Highway Traffic Safety Administration.
Planned improvements have been coordinated among the New Hampshire Department of Transportation, the Federal Highway Administration, and local stakeholders including the City of Portsmouth and Rockingham Planning Commission. Proposals emphasize safety upgrades, intersection improvements near the Pease International Tradeport, and multimodal accommodations connecting to Portsmouth Regional Transportation Center and Amtrak-served corridors. Environmental review processes consider effects on the Piscataqua River and nearby conservation areas such as the Great Bay National Estuarine Research Reserve. Funding sources under discussion reference discretionary grants from the U.S. Department of Transportation and state transportation appropriations, with schedules aligned to regional resiliency plans addressing sea-level rise and coastal storm impacts identified by the National Oceanic and Atmospheric Administration.
Category:U.S. Highways in New Hampshire Category:Transportation in Rockingham County, New Hampshire