New Hampshire Route 3A
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| Route information | ||||
| Auxiliary route of US 3 | ||||
| Maintained by NHDOT | ||||
| Southern segment | ||||
| Length: | 39.412 mi (63.427 km) | |||
| South end: |
 Route 3A in Tyngsborough, MA
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| Major junctions: |
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| North end: |
 US 3 in Concord
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| Northern segment | ||||
| Length: | 31.015 mi (49.914 km) | |||
| South end: |
  US 3 / NH 11 / NH 127 in Franklin
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| Major junctions: |
 US 3 / NH 25 in Plymouth
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| North end: |
 I‑93 in Plymouth |
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| Location | ||||
| Counties: | Hillsborough, Merrimack, Grafton | |||
| Highway system | ||||
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New Hampshire Route 3A is a designation held by two separate state highways in New Hampshire. The two segments, although not directly connected, are linked by U.S. Route 3, from which they derive their route number.
The southern terminus of the 39.40-mile (63.41 km) long southern segment is at the Massachusetts state line in Hudson, where it continues as Massachusetts Route 3A. The northern terminus is in the city of Concord at US 3. This segment of NH 3A follows the Merrimack River for its entire length. The route begins in Hudson at the Massachusetts line. It shortly intersects with the eastern end of the Circumferential Highway (which provides access to US 3 and the Everett Turnpike). NH 3A passes through Hudson Village, the historic center of town, where it intersects with NH 111 just across the river from downtown Nashua. NH 102 begins at this intersection and is cosigned with NH 3A for its first mile, before splitting off northeast towards Londonderry. NH 3A continues along the eastern banks of the river, through Litchfield and into the city of Manchester, where it crosses under I-293/NH 101 and follows a short surface alignment in the southwest section of town. NH 3A intersects with US 3 and is actually cosigned with it (in a wrong-way concurrency on Queen City Ave across the river, where the two routes intersect NH 114A at its eastern terminus. At this point, NH 3A leaves US 3 and merges onto I-293 northbound (which also carries the Everett Turnpike) at exit 4. NH 3A is concurrent with I-293 for three miles, departing at exit 7 and crossing into Hooksett. The highway immediately interchanges with I-93 (which it parallels for the remainder of its length) near the northern terminus of I-293, and continues north (now paralleling on the west side of the river). Hackett Hill Road provides another access point to I-93, while nearby Main Street connects to US 3/NH 28 across the river. NH 3A enters Bow and meets the southern end of the I-89 freeway (another access point to I-93) before crossing into the city limits of Concord. The highway interchanges with I-93 one last time before ending at US 3 just south of downtown Concord.
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Wikipedia