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| New Hampshire Route 108 | |
|---|---|
| State | NH |
| Type | NH |
| Route | 108 |
| Length mi | 33.057 |
| Terminus a | Haverhill border |
| Terminus b | Portsmouth |
| Counties | Rockingham County; Strafford County |
New Hampshire Route 108
New Hampshire Route 108 is a state highway in eastern New Hampshire connecting the Massachusetts border near Haverhill with the Atlantic coastal city of Portsmouth. The route traverses suburban and rural landscapes, linking towns such as South Hampton, Exeter, Dover, and Newmarket while intersecting major corridors including Interstate 95, U.S. Route 1, and New Hampshire Route 16. It serves commuters, commercial traffic, and access to regional institutions including Portsmouth Naval Shipyard-adjacent facilities and Dover Air Force Base-area employers.
The route begins at the Massachusetts–New Hampshire border adjacent to Haverhill and proceeds north through Plaistow toward Amesbury-proximate suburbs and the Merrimack corridor. Passing through Kingston and Exeter, the highway intersects US 1 near Seacoast communities and provides access to Hampton Beach-area tourism via connecting state routes. Northbound, the road serves Newmarket and Durham commuter flows to UNH before continuing to Dover, where it meets NH 16 and regional arterial links used by traffic heading toward I-95. Approaching Portsmouth, the corridor crosses commercial districts, historic districts such as Strawbery Banke, and maritime facilities like Portsmouth Harbor.
Originally established as part of early 20th-century New England highway planning influenced by New England Interstate Routes conventions, the road followed preexisting turnpikes and stagecoach roads connecting Massachusetts Bay Colony settlements to Piscataqua ports. Twentieth-century improvements were driven by growth tied to industrial sites including Amesbury Car Company-era manufacturing and naval logistics linked to Portsmouth Naval Shipyard. Mid-century expansions paralleled the construction of Interstate 95 and the postwar suburbanization associated with employers such as Pease Air Force Base and the regional expansion of nowadays Wentworth-Douglass Hospital. Preservation debates in downtown sections involved stakeholders like the Portsmouth Historical Society and state transportation planners, echoing broader preservation efforts similar to those undertaken at Strawbery Banke Museum.
The corridor intersects several principal routes and transportation nodes that connect to interstate and U.S. networks: crossings with Interstate 95 near Exeter; junctions with US 1 in coastal communities; connections to NH 16 near Dover; access ramps toward I-295-linked corridors; and municipal connectors into Portsmouth Naval Shipyard and Seacoast Regional Airport facilities. These intersections create links to broader corridors such as U.S. Route 4, NH 101, and feeder routes that serve commuters to institutions like UNH and Dover High School catchment areas. Freight movements tie into rail terminals served historically by Boston and Maine Railroad rights-of-way and current logistics centers near Pease International Tradeport.
Traffic volumes vary from lower-density rural segments in Rockingham County to congested suburban stretches near Exeter, Dover, and Portsmouth. Peak flows correspond with commuter patterns to employment centers like Wentworth-Douglass Hospital, Eaton Corporation facilities, and government installations associated with Naval Shipyard operations. Seasonal tourism spikes reflect access to Hampton Beach and seacoast cultural attractions such as Prescott Park and Portsmouth Music Hall, increasing weekend and summer congestion. Multimodal considerations include pedestrian corridors near Strawbery Banke, bicycling routes connected to Seacoast Bikeways initiatives, and transit interfaces with providers such as COAST (Cooperative Alliance for Seacoast Transportation) and commuter bus services to Boston.
Planned projects emphasize safety upgrades, intersection redesigns, and multimodal facilities coordinated by the New Hampshire Department of Transportation in collaboration with municipal partners including Portsmouth City Council and Dover City Council. Proposed improvements reflect lessons from federal programs like SAFETEA-LU and FAST Act funding streams, aiming to reduce congestion near key nodes by deploying signalization modernization, roundabout installations informed by examples at Roundabout implementations in New England, and bicycle-pedestrian infrastructure akin to projects in Concord and Manchester. Long-range planning considers resilience against coastal storms affecting Portsmouth Harbor and integrates land use coordination with economic development agencies such as Seacoast Economic Development Corporation and regional transit planners coordinating with Northern New England Passenger Rail proposals.