New Hampshire Route 18

New Hampshire Route 18 marker

Map of New Hampshire Route 18

Map of Grafton County in northwestern New Hampshire with NH 18 highlighted in red

Route information

Maintained by NHDOT

Length:

20.116 mi^[1] (32.374 km)

Major junctions

South end:

I‑93 / US 3 in Franconia

I‑93 in Littleton
US 302 in Littleton

North end:

VT 18 in Waterford, VT

Location

Counties:

Grafton

Highway system

New Hampshire Highway System

←

NH 16B

NH 25

→

New Hampshire Route 18 is a 20.116-mile-long (32.374 km) state highway in northwestern New Hampshire. It is a local road serving Franconia, Bethlehem, and Littleton, New Hampshire, which I-93 bypasses. Its northern extension, Vermont Route 18, continues northward from the Connecticut River to St. Johnsbury, Vermont. NH 18 closely parallels I-93 for its entire length and has several interchanges with the Interstate highway.

Route description

NH 18 begins as a spur of I-93 (the Franconia Notch Parkway) at the height of land in Franconia Notch. (U.S. Route 3 is overlapped with I-93 on the Parkway.) NH 18 proceeds to the northwest, intersecting NH 141 and NH 142, near its interchange with I-93. In downtown Franconia, NH 18 joins with NH 116 and meets the eastern end of NH 117 before leaving town and crossing into Bethlehem. NH 18 has two interchanges with I-93 in Bethlehem, joining U.S. Route 302 westbound at the second one (US 302 east provides access to downtown). The highway crosses into Littleton, splitting with NH 116 in the center of town. Just west of downtown, US 302 splits from NH 18 as well. (This intersection is signed as the northern terminus of NH 10, although this designation officially ends much further south.) Northwest of town, NH 18 joins NH 135 near another interchange with I-93. The two routes have a direct interchange with I-93 near the Connecticut River at exit 44 (I-93's last exit in New Hampshire). NH 135 splits off NH 18 before it crosses the river into Vermont (along with I-93 to its west) and becomes VT 18.

Junction list

The entire route is in Grafton County. ^[1]^[2]

Location^[1]^[2]	mi^[1]^[2]	km	Destinations	Notes
Franconia	0.000– 0.053	0.000– 0.085	I‑93 / US 3 (Franconia Notch Parkway)	Southern terminus; Exit 34C on I-93
	2.804	4.513	NH 141 (Butterhill Road) – Twin Mountain	Western terminus of NH 141
	4.070	6.550	NH 142 (Forest Hill Road) to I‑93 south – Bethlehem	Southern terminus of NH 142
	4.825	7.765	NH 116 south (Easton Road) – Easton, Littleton, Plymouth Wallace Hill Road to I‑93	Southern end of concurrency with NH 116; Exit 38 on I-93
	5.300	8.530	NH 117 (Sugar Hill Road) – Sugar Hill	Eastern terminus of NH 117
Bethlehem	7.533– 7.719	12.123– 12.423	I‑93 north (Styles Bridges Highway) – Littleton	Exit 39 on I-93
Bethlehem	9.525	15.329	I‑93 (Styles Bridges Highway) / US 302 east (Main Street) – Bethlehem, Littleton, St. Johnsbury, VT, Franconia, Plymouth	Southern end of concurrency with US 302; Exit 40 on I-93
Littleton	11.826	19.032	NH 116 north (Union Street) – Whitefield, Berlin	Northern end of concurrency with NH 116
	12.382	19.927	US 302 west (Meadow Street) to I‑93 – Lisbon, Woodsville Also signed as NH 10 south.	Northern end of concurrency with US 302
	14.016	22.557	NH 135 north (North Littleton Road) – Dalton	Southern end of wrong-way concurrency with NH 135
	18.722– 19.042	30.130– 30.645	I‑93 (Styles Bridges Highway) – Littleton, Plymouth, St. Johnsbury, VT	Exit 44 on I-93
	19.831	31.915	NH 135 south (Monroe Road) – Woodsville, Monroe	Northern end of wrong-way concurrency with NH 135
	20.116	32.374	VT 18 – Waterford	Continuation into Vermont
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access