North Dakota Highway 18

North Dakota Highway 18 is a major north–south highway in eastern North Dakota. It runs from Highway 30 at the Canadian border south of Gretna, Manitoba to South Dakota Highway 25 north of Claire City.^[2]

North Dakota Highway 18 begins at the border with South Dakota where that state's Highway 25 crosses the border. Highway 18 travels north for nine miles and joins with North Dakota Highway 11 just two miles east of Ligerwood and heads west and north, passing through the town, where the concurrency ends. The highway travels alone north for five miles, jogs east for a mile, then heads seven miles north again to the intersection with North Dakota Highway 13 directly south of Wyndmere.

The road leaves that town traveling northward twelve miles more to reach the eastern terminus of North Dakota Highway 27, then travels thirteen miles further north to the line between Richland County and Cass County. There it begins a concurrency with North Dakota State Highway 46 to travel west along the county line for five miles until it diverges, traveling north two miles to the town of Leonard. Reaching Leonard, it travels six miles north and one mile east, then north nine more miles to reach an interchange with Interstate 94 and US 52. One mile north of this the road enters Casselton. The highway leaves Casselton to the west, turns immediately north and travels fourteen miles that direction to Arthur. Passing through it, the road heads north six more miles to enter Hunter. It then travels yet three miles north to the Traill County line.

Once in Traill county it runs eight miles north to Blanchard. The highway leaves Blanchard on the west, traveling five miles that direction then north for ten miles more to reach Mayville. There, it runs concurrent with North Dakota Highway 200 west for a mile out of town before entering Portland. Then it runs northwest for a mile, west for a mile and a half, and north for a mile before it diverges from Highway 200 to travel north for eight miles to Hatton. Two miles north of Hatton it reaches the line with Grand Forks County. Highway 18 then moves north for five miles, joining to run westward with North Dakota Highway 15 for eight miles, passing just north of Northwood on the way. Then the two roads separate and Highway 18 turns north to travel twelve miles to the city of Larimore. Two miles north of the city Highway 18 reaches a junction with US Highway 2, a major east-west route of the northern United States. Fourteen miles north of this interchange North Dakota Highway 18 passes Inkster two miles to the west. Three miles north of that it reaches the county line with Walsh County.

Fourteen miles north of the county line it begins to run with North Dakota State Highway 17 for a mile, passing midway between the cities of Grafton and Park River in the distance. It continues north alone for eight miles to pass to the east of the small city of Hoople, just south of the line with Pembina County.

Four miles north of the county line the road intersects with North Dakota Highway 66, then travels thirteen miles north to Cavalier. It joins with North Dakota Highway 5 in Cavalier and runs concurrent with it north of the city for a mile, then east for three where they split and the highway turns north. It runs north for thirteen miles to Neche, where it crosses the Pembina River. A mile north of this it terminates its journey at the Canadian border at Gretna, Manitoba.

North Dakota Highway 18, like many other North Dakota state highways, was put into alignment in 1939. It has remained in its original alignment since then.^[2]

County	Location	mi[1]	km	Destinations	Notes
Pembina	​	242.147	389.698	PTH 30 north – Gretna	Continuation into Manitoba, Canada
	​	228.609	367.911	ND 5 east – Hamilton	Northern end of ND 5 concurrency
	Cavalier	224.991	362.088	ND 5 west – Langdon	Southern end of ND 5 concurrency
	​	211.591	340.523	ND 66 – Milton, Drayton
Walsh	​	198.447	319.369	ND 17 east – Grafton	Northern end of ND 17 concurrency
	​	197.571	317.960	ND 17 west – Park River	Southern end of ND 17 concurrency
Grand Forks	​	166.225	267.513	US 2 – Devils Lake, Grand Forks
	​	152.185	244.918	ND 15 west – McVille	Western end of ND 15 concurrency
	​	114.902	184.917	ND 15 east – Thompson	Eastern end of ND 15 concurrency
Traill	​	129.127	207.810	ND 200 west – Finley	Western end of ND 200 concurrency
	Mayville	121.814	196.041	ND 200 east – I-29/US 81	Eastern end of ND 200 concurrency
	​	106.883	172.012	ND 200A – I-29/US 81	Western terminus of ND 200A
Cass	Casselton	73.550	118.367	ND 10 west (37th Street SE)	Northern end of ND 10 concurrency, unsigned
		73.407	118.137	I-94 / US 52 – Jamestown, Fargo	I-94 Exit 331
		73.258	117.897	ND 10 east (37th Street SE) – Durbin	Southern end of ND 10 concurrency, unsigned
Cass–Richland county line	​	55.589	89.462	ND 46 west – Enderlin	Western end of ND 46 concurrency Entire concurrency is along the county line
	​	50.650	81.513	ND 46 east – Kindred	Eastern end of ND 46 concurrency
Richland	​	37.664	60.614	ND 27 west – Lisbon	Eastern terminus of ND 27
	Wyndmere	24.827	39.955	ND 13 – Milnor, Wahpeton
	Lidgerwood	11.760	18.926	ND 11 west – Forman	Western end of ND 11 concurrency
	​	9.198	14.803	ND 11 east – Hankinson	Eastern end of ND 11 concurrency
Roberts	​	0.000	0.000	SD 25 south – Claire City	Continuation into South Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus