# Saskatchewan Highway 18

Highway 18 is a provincial highway in the Canadian province of Saskatchewan. It runs from Highway 13 near Robsart, approximately 65 kilometres (40 mi) east of the Alberta border, to the Manitoba border near Gainsborough, where it becomes Manitoba Highway 3. It passes through three major communities, all in south-east Saskatchewan — Estevan, Oxbow, and Carnduff. It also passes north of the West and East Blocks of Grasslands National Park. Highway 18 is about 712 kilometres (442 mi) long, which is the longest east–west highway and second longest highway in Saskatchewan.

## History

The original segment of Highway 18 ran from the Manitoba border, through Estevan, to Lake Alma, before turning north, passing through Radville, and terminating at Highway 13 approximately 30 kilometres (19 mi) west of Weyburn. In the 1960s, Highway 18 was extended west to Highway 6 near Minton along an upgraded grid road, resulting in the north–south section between Lake Alma and Highway 13 being renumbered as Highway 28. In the 1970s, Highway 18 was again extended west along a series of upgraded grid roads and existing highways — former highways include Highway 336 between Coronach and Rockglen; Highway 319 between Wood Mountain and Highway 19 near Mankota; and Highway 46 between Highway 4 near Orkney and Claydon.

## Route description

The western terminus of Highway 18 begins south of the Cypress Hills at Highway 13 and Robsart. The highway heads south from there for 26 kilometres (16 mi) towards the Canada–United States border before beginning its eastward routing. Travelling east, Highway 18 provides access to Divide, Claydon, Loomis, and Frontier as it heads to Highway 37 and Climax. It has a short 1.4-kilometre (0.87 mi) long concurrency with the north–south 37 before resuming its eastward routing towards Val Marie. Communities along this stretch include Canuck, Bracken, Orkney, and Masefield. Leading up to Val Marie, Highway 18 shares a 15-kilometre (9.3 mi) long concurrency with Highway 4. Access to the West Block of the Grasslands 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 the Frenchman River. Several kilometres east of Val Marie, Highway 18 turns north and enters the Wood Mountain Hills. Once in the hills, it turns east and follows the northern slopes towards the village of Wood Mountain. Communities along this stretch include Mankota, Ferland, McCord, Glentworth, and Fir Mountain. 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 by Wood Mountain Regional Park and Wood Mountain Provincial Park. It continues south out of the hills where it provides access to the East Block of Grasslands National Park and meets Highway 2 a few kilometres north of the U.S. border. Highways 2 and 18 begin an eastward concurrency that continues to Rockglen. Communities along this segment include Killdeer, Canopus, and Quantock. East of Canopus, the highway crosses the Poplar River. At Rockglen Highway 2 turns north while 18 continues east to Highway 36. Along this stretch, Highway 18 provides access to Fife Lake and Rockin Beach Regional Park.
At the junction with Highway 36, the two highways begin a 21-kilometre (13 mi) long concurrency that heads south-east towards Coronach. Highway 36 drops south to the U.S. border while 18 continues eastward past Big Beaver towards the Big Muddy Badlands and Highway 6. Highway 6 and 18 have a 9.7-kilometre (6.0 mi) long concurrency that heads north towards Minton. Prior to Minton, 18 turns back east. It continues east en route to Estevan providing access to several communities including Gladmar, Lake Alma, Beaubier, Ratcliffe, Oungre, Torquay, and Outram; intersects Highways 28, 707, 35, 606, 350 and 47; and crosses Long Creek and Souris 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. 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 with Highway 39A and then Highway 39. About 9 kilometres (5.6 mi) east of Estevan, Highways 18 and 39 split off with 39 turning south-east to North Portal and the Canada–United States border and 18 continuing east towards the border with Manitoba.
Bienfait, 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 as Hirsch, Frobisher, Oxbow, Glen Ewen, Carnduff, Carievale, and Gainsborough; intersects several highways, including 605, 604, 9, 603, 601, 318, 8, and 600; and crosses the rivers of Moose Mountain Creek, Antler River, and Gainsborough Creek. The eastern terminus, at only 2 miles east of Gainsborough, is at the border with Manitoba where it carries on as Manitoba Highway 3.

## Major intersections

From west to east:
| Rural municipality | Location | km | 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 | | |
| Frontier No. 19 | ​ | 71.3 | 44.3 | Highway 614 north – Eastend | |
| Frontier No. 19 | 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 |
| Lone Tree No. 18 | Climax | 97.8 | 60.8 | Highway 37 south – Port of Climax (U.S. border) | East end of Hwy 37 concurrency |
| Lone Tree No. 18 | Bracken | 119.5 | 74.3 | | |
| Lone Tree No. 18 | Orkney | 133.1 | 82.7 | | |
| Val Marie No. 17 | ​ | 139.9 | 86.9 | Highway 4 south – U.S. border (Port of Monchy) | South of Masefield Hwy 18 branches north; west end of Hwy 4 concurrency |
| Val Marie No. 17 | ​ | 149.1 | 92.6 | Highway 607 east – Grasslands National Park (West Block) | |
| Val Marie No. 17 | 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 | |
| Glen McPherson No. 46 | ​ | 204.9 | 127.3 | Highway 612 – Aneroid, Reliance | |
| Mankota No. 45 | Mankota | 221.5 | 137.6 | | |
| Mankota No. 45 | ​ | 227.3 | 141.2 | Highway 19 north – Kincaid | East of Ferland |
| Mankota No. 45 | McCord | 240.7 | 149.6 | Highway 611 north – Meyronne | |
| Waverley No. 44 | ​ | 247.2 | 153.6 | Highway 610 north – Woodrow | |
| Waverley No. 44 | Glentworth | 252.1 | 156.6 | | |
| Waverley No. 44 | ​ | 263.8 | 163.9 | Highway 58 north – Lafleche | West of Fir Mountain |
| Old Post No. 43 | Wood Mountain | 279.3 | 173.5 | Highway 358 north – Limerick | Hwy 18 branches south |
| Old Post No. 43 | ​ | 307.7 | 191.2 | Township Road 22 – Grasslands National Park (East Block) | |
| Old Post No. 43 | 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 |
| Poplar Valley No. 12 | ​ | 365.2 | 226.9 | Fife Lake Access Road | |
| Poplar Valley No. 12 | ​ | 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 | |
| Hart Butte No. 11 | ​ | 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 |
| Surprise Valley No. 9 | 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 | |
| Souris Valley No. 7 | Oungre | 526.9 | 327.4 | Highway 35 (CanAm Highway) – Weyburn, U.S. border (Port of Oungre) | |
| Souris Valley No. 7 | ​ | 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 | No major junctions | No major junctions | No major junctions | No major junctions |
| City of Estevan | City of Estevan | 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 |
| City of Estevan | City of Estevan | 589.1 | 366.0 | 4th Street (Highway 39A north) / Highway 47 north – Weyburn, StoughtonSouris Avenue | Hwy 18 branches east; east end of Hwy 47 concurrency; west end of Hwy 39A concurrency |
| City of Estevan | City of Estevan | 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 | |
| Coalfields No. 4 | ​ | 625.5 | 388.7 | Highway 604 south – North Portal | West end of Hwy 604 concurrency |
| Coalfields No. 4 | 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 |
| Enniskillen No. 3 | ​ | 644.5 | 400.5 | Highway 9 north – Alameda, Carlyle | East end of concurrency with Hwy 9 |
| Enniskillen No. 3 | Oxbow | 651.0 | 404.5 | Highway 603 south | West end of Hwy 603 concurrency |
| Enniskillen No. 3 | ​ | 659.5 | 409.8 | Highway 603 north – Manor | East end of Hwy 603 concurrency |
| Enniskillen No. 3 | Glen Ewen | 662.8 | 411.8 | Highway 601 north | |
| Mount Pleasant No. 2 | Carnduff | 680.1 | 422.6 | Highway 318 north – Alida | |
| Mount Pleasant No. 2 | ​ | 691.7 | 429.8 | Highway 8 north – Redvers, Moosomin | West end of Hwy 8 concurrency |
| Mount Pleasant No. 2 | 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 | |
| Argyle No. 1 | ​ | 711.9 | 442.4 | PTH 3 east – Melita, Morden, Winnipeg | Continuation into Manitoba |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Route transition ||||||