Highway 18
Highway 18 highlighted in red
Highway 18 at dawn in winter
Route information
Maintained byMinistry of Highways and Infrastructure
Length	711.9 km[1] (442.4 mi)
Major junctions
West end	Highway 13 nearRobsart
Major intersections	Highway 37 atClimax Highway 4 atVal Marie Highway 19 nearMankota Highway 2 atKilldeer andRockglen Highway 36 nearCoronach Highway 6 atMinton Highway 35 atOungre Highway 47 atEstevan Highway 9 nearAlameda Highway 8 atCarievale
East end	PTH 3 atManitoba border nearGainsborough
Location
Country	Canada
Province	Saskatchewan
Rural municipalities	Reno,Frontier,Lone Tree,Val Marie,Glen McPherson,Mankota,Waverley,Old Post,Poplar Valley,Hart Butte,Happy Valley,Surprise Valley,Lake Alma,Cambria,Estevan,Coalfields,Enniskillen,Mount Pleasant,Argyle
Major cities	Estevan
Highway system
Provincial highways in Saskatchewan
←Highway 17 →Highway 19

Highway 18 is an east–westprovincial highway in theCanadian province ofSaskatchewan. It runs fromHighway 13 nearRobsart, approximately 65 kilometres (40 mi) east of theAlberta border, to theManitoba border nearGainsborough, where it becomesManitoba Highway 3. It passes through three major communities, all in south-east Saskatchewan —Estevan,Oxbow, andCarnduff. It also passes north of the West and East Blocks ofGrasslands National Park. Highway 18 is about 712 kilometres (442 mi) long, which is the longest east–west highway and second longest highway in Saskatchewan.

The original segment of Highway 18 ran from the Manitoba border, through Estevan, toLake Alma, before turning north, passing throughRadville, and terminating at Highway 13 approximately 30 kilometres (19 mi) west ofWeyburn.^[2] In the 1960s, Highway 18 was extended west toHighway 6 nearMinton along an upgraded grid road, resulting in the north–south section between Lake Alma and Highway 13 being renumbered asHighway 28.^[3] In the 1970s, Highway 18 was again extended west along a series of upgraded grid roads and existing highways — former highways includeHighway 336 betweenCoronach andRockglen;Highway 319 betweenWood Mountain andHighway 19 nearMankota; andHighway 46 betweenHighway 4 nearOrkney andClaydon.^[3][4]

The western terminus of Highway 18 begins south of theCypress Hills atHighway 13 and Robsart as agravel road. The highway heads south from there for 26 kilometres (16 mi) towards theOld Man on His Back Plateau and theCanada–United States border before beginning its eastward routing. Travelling east, Highway 18 rounds the southern slopes of Old Man on His Back Plateau and provides access toDivide,Old Man on His Back Prairie and Heritage Conservation Area,^[5]Claydon,Loomis, andFrontier^[6] as it heads toHighway 37 andClimax. From Claydon east, the highway ispaved.^[7] It has a short 1.4-kilometre (0.87 mi) longconcurrency with the north–south 37 before resuming its eastward routing towardsVal Marie.^[8] Communities along this stretch includeCanuck,Bracken,^[9]Orkney, andMasefield. Leading up to Val Marie, Highway 18 shares a 15-kilometre (9.3 mi) long concurrency withHighway 4. Access to the West Block of theGrasslands National Park is about 5 kilometres (3.1 mi) south of Val Marie.

At Val Marie, Highway 18 leaves the concurrency with 4 and heads east through town along River Street and then crosses theFrenchman River. Several kilometres east of Val Marie, Highway 18 turns north and enters theWood Mountain Hills. Once in the hills, it turns east and follows the northern slopes towards the village ofWood Mountain. Communities along this stretch includeMankota,^[10]Ferland,McCord,^[11]Glentworth,^[12] andFir Mountain.^[13] East of McCord, the highway crosses Wood River. About one mile south of Wood Mountain, Highway 18 turns south where it once again enters the Wood Mountain Hills and passes byWood Mountain Regional Park andWood Mountain Provincial Park. It continues south out of the hills where it provides access to the East Block of Grasslands National Park and meetsHighway 2 a few kilometres north of the U.S. border. Highways 2 and 18 begin an eastward concurrency that continues toRockglen.^[14] Communities along this segment includeKilldeer,Canopus, andQuantock. East of Canopus, the highway crosses thePoplar River. At Rockglen Highway 2 turns north while 18 continues east toHighway 36. Along this stretch, Highway 18 provides access toFife Lake^[15] andRockin Beach Regional Park.^[16]

At the junction with Highway 36, the two highways begin a 21-kilometre (13 mi) long concurrency that heads south-east towardsCoronach.^[17] Highway 36 drops south to the U.S. border while 18 continues eastward pastBig Beaver^[18] towards theBig Muddy Badlands andHighway 6. Highway 6 and 18 have a 9.7-kilometre (6.0 mi) long concurrency that heads north towardsMinton. Prior to Minton, 18 turns back east. It continues east en route toEstevan providing access to several communities includingGladmar,^[19]Lake Alma,^[20]Beaubier,^[21]Ratcliffe,Oungre,^[22]Torquay,^[23] andOutram; intersectsHighways 28,707,35,606,350 and47; and crossesLong Creek andSouris River. On the south side of Estevan, Highway 18 meets Highway 47 and begins a short northward 1.4-kilometre (0.87 mi) long concurrency that goes into the city.^[24] Near the centre of town, Highway 47 turns west concurrent with 4th Street and 18 turns east concurrent 4th Street. As 18 leaves Estevan, it opens up into a 10-kilometre (6.2 mi) long divided highway that runs concurrently withHighway 39A and thenHighway 39. About 9 kilometres (5.6 mi) east of Estevan, Highways 18 and 39 split off with 39 turning south-east toNorth Portal and the Canada–United States border and 18 continuing east towards the border with Manitoba.

Bienfait,^[25] the first community on this section of highway, is about 3 kilometres (1.9 mi) east of Highway 18's junction with 39. The highway continues east from Bienfait and provides access to multiple communities, such asHirsch,Frobisher,^[26]Oxbow,^[27]Glen Ewen,^[28]Carnduff,^[29]Carievale,^[30] andGainsborough;^[31] intersects several highways, including605,604,9,603,601,318,8, and600; and crosses the rivers ofMoose Mountain Creek,Antler River, andGainsborough Creek. The eastern terminus, at only 2 miles east of Gainsborough, is at the border with Manitoba where it carries on asManitoba Highway 3.

From west to east:^[32]

Rural municipality	Location	km[1]	mi	Destinations	Notes
Reno No. 51	Robsart	0.0	0.0	Highway 13 (Red Coat Trail) –Consul,Eastend,Shaunavon
Frontier No. 19	Claydon	59.9	37.2
	​	71.3	44.3	Highway 614 north –Eastend
	Frontier	84.3	52.4	Highway 613 north –Dollard
Lone Tree No. 18	Climax	96.4	59.9	Highway 37 north –Shaunavon,Gull Lake	Hwy 18 branches east; west end of Hwy 37 concurrency
		97.8	60.8	Highway 37 south –Port of Climax (U.S. border)	East end of Hwy 37 concurrency
	Bracken	119.5	74.3
	Orkney	133.1	82.7
Val Marie No. 17	​	139.9	86.9	Highway 4 south –U.S. border (Port of Monchy)	South ofMasefield Hwy 18 branches north; west end of Hwy 4 concurrency
	​	149.1	92.6	Highway 607 east –Grasslands National Park (West Block)
	Val Marie	154.7	96.1	Highway 4 north –Swift Current	Hwy 18 branches east; east end of Hwy 4 concurrency
Glen McPherson No. 46	​	190.3	118.2	Highway 628 north –Ponteix
	​	204.9	127.3	Highway 612 –Aneroid,Reliance
Mankota No. 45	Mankota	221.5	137.6
	​	227.3	141.2	Highway 19 north –Kincaid	East ofFerland
	McCord	240.7	149.6	Highway 611 north –Meyronne
Waverley No. 44	​	247.2	153.6	Highway 610 north –Woodrow
	Glentworth	252.1	156.6
	​	263.8	163.9	Highway 58 north –Lafleche	West ofFir Mountain
Old Post No. 43	Wood Mountain	279.3	173.5	Highway 358 north –Limerick	Hwy 18 branches south
	​	307.7	191.2	Township Road 22 –Grasslands National Park (East Block)
	Killdeer	311.3	193.4	Highway 2 south –U.S. border (Port of West Poplar River)	Hwy 18 branches north; west end of Hwy 2 concurrency
Poplar Valley No. 12	Rockglen	348.5	216.5	Highway 2 north –Assiniboia,Moose Jaw	Hwy 18 branches east; east end of Hwy 2 concurrency
	​	365.2	226.9	Fife Lake Access Road
	​	371.9	231.1	Highway 36 north –Willow Bunch	Hwy 18 branches southeast; west end of Hwy 36 concurrency
Hart Butte No. 11	Coronach	383.0	238.0	Highway 602 north –Harptree
	​	393.4	244.4	Highway 36 south –U.S. border (Port of Coronach)	East end of Hwy 36 concurrency
Happy Valley No. 10	Big Beaver	411.9	255.9	Highway 34 –Bengough,U.S. border (closed)	Border crossing to U.S. closed.
Surprise Valley No. 9	​	460.1	285.9	Highway 6 south –U.S. border (Port of Regway)	Hwy 18 branches north; west end of Hwy 6 concurrency
	Minton	469.9	292.0	Highway 6 north –Regina	Hwy 18 branches east; east end of Hwy 6 concurrency
Lake Alma No. 8	Lake Alma	497.7	309.3	Highway 28 north –Radville
Souris Valley No. 7	​	507.5	315.3	Highway 707 south –Beaubier
	Oungre	526.9	327.4	Highway 35 /CanAm Highway –Weyburn,U.S. border (Port of Oungre)
	​	536.6	333.4	Bromhead Access Road
Cambria No. 6	Torquay	549.6	341.5	Highway 350 south –U.S. border (Port of Torquay) Highway 606 north –Midale
Estevan No. 5	No major junctions
City ofEstevan		587.7	365.2	Souris Avenue (Highway 47 south) –U.S. border (Port of Estevan Highway)	Hwy 18 branches north; west end of Hwy 47 concurrency
		589.1	366.0	4th Street (Highway 39A north) /Highway 47 north –Weyburn,Stoughton Souris Avenue	Hwy 18 branches east; east end of Hwy 47 concurrency; west end of Hwy 39A concurrency
		594.2	369.2	Highway 39 north (Estevan Bypass) –Weyburn,Regina	East end of Hwy 39A concurrency; west end of Hwy 39 concurrency
Estevan No. 5	​	600.5	373.1	Highway 39 south –North Portal,U.S. border (Port of North Portal)	Hwy 18 branches east; west end of Hwy 39 concurrency
↑ / ↓	Bienfait	602.9	374.6
Coalfields No. 4	​	606.5	376.9	Highway 605 north –Lampman
	​	625.5	388.7	Highway 604 south –North Portal	West end of Hwy 604 concurrency
	Frobisher	630.5	391.8	Highway 604 north –Arcola	East end of Hwy 604 concurrency
Enniskillen No. 3	​	642.9	399.5	Highway 9 south –U.S. border (Port of Northgate)	West end of concurrency with Hwy 9
	​	644.5	400.5	Highway 9 north –Alameda,Carlyle	East end of concurrency with Hwy 9
	Oxbow	651.0	404.5	Highway 603 south	West end of Hwy 603 concurrency
	​	659.5	409.8	Highway 603 north –Manor	East end of Hwy 603 concurrency
	Glen Ewen	662.8	411.8	Highway 601 north
Mount Pleasant No. 2	Carnduff	680.1	422.6	Highway 318 north –Alida
	​	691.7	429.8	Highway 8 north –Redvers,Moosomin	West end of Hwy 8 concurrency
	Carievale	692.4	430.2	Highway 8 south –U.S. border (Port of Carievale)	East end of Hwy 8 concurrency
Argyle No. 1	Gainsborough	706.5	439.0	Highway 600 north –Fertile
	​	711.9	442.4	PTH 3 east –Melita,Morden,Winnipeg	Continuation intoManitoba
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Route transition

• Roads in Saskatchewan
• Transportation in Saskatchewan

Media related toSaskatchewan Highway 18 at Wikimedia Commons

• Saskatchewan provincial highways
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