Map of southern New Hampshire with NH 123 highlighted in red | ||||
Route information | ||||
Maintained by NHDOT | ||||
Length | 63.055 mi[1] (101.477 km) | |||
Major junctions | ||||
South end | Mason Road in Townsend, MA | |||
North end | ![]() | |||
Location | ||||
Country | United States | |||
State | New Hampshire | |||
Counties | Hillsborough, Cheshire, Sullivan | |||
Highway system | ||||
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New Hampshire Route 123 (abbreviated NH 123) is a 63.055-mile-long (101.477 km) secondary north–south state highway in southwestern New Hampshire. The southern terminus of the route is at the Massachusetts state line in Mason where, as Mason Road, the road continues as an unnumbered local road in the town of Townsend. The northern terminus, as signed, is at the Connecticut River, where the highway continues west for 0.313 miles (0.504 km) to U.S. Route 5 in Westminster, Vermont, as Vermont Route 123 (VT 123). Route logs, however, place the terminus at New Hampshire Route 12 in Walpole.
In Walpole, NH 123 runs in a wrong-way concurrency with NH 12 north–south alongside the Connecticut River, the water body that represents the border between New Hampshire and Vermont. For the entire length of the NH 12/NH 123 concurrency, NH 123 South is, in reality, heading north on the compass while NH 123 North is traveling to the south.
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