# U.S. Route 191 in Montana

U.S. Highway 191 (US 191) is a north-south United States Numbered Highway in the state of Montana. It extends approximately 442.2 miles (711.7 km) from Yellowstone National Park north to the Canadian border.

## Route description

US 191 in Montana begins at the West Entrance to Yellowstone National Park concurrent with US 20 and US 287, at the edge of the town of West Yellowstone. Some commercially produced maps show US 191 going through Yellowstone National Park; however, it officially has a gap inside the park and resumes in Wyoming at the South Entrance. A few blocks into West Yellowstone, US 20 leaves the US 191 / US 287 concurrency and heads west toward the Targhee Pass and Idaho. The highway heads north, running concurrently with US 287 for eight miles (13 km) before veering slightly east and passing through Yellowstone National Park for 20 miles (32 km), traversing forested, mountainous terrain and briefly following a 5.5-mile (8.9 km) diversion into the state of Wyoming, before leaving the park in the upper reaches of the Gallatin River canyon. The route travels northward through the narrow canyon, past the resort community of Big Sky, then entering the Gallatin Valley near the town of Gallatin Gateway. US 191 travels north and east through the valley to the city of Bozeman, which is the largest city along the entire US 191 route.
From Bozeman, US 191 is concurrent with I-90 eastward 60.5 miles (97.4 km) to Big Timber, where it proceeds north. The road travels through hilly ranch country near the eastern edge of the Crazy Mountains to Harlowton, where US 191 is briefly concurrent with US 12. North of Harlowton, US 191 is concurrent with MT 3 for 39 miles (63 km) to Eddie's Corner, where US 191 proceeds eastward to Lewistown on a roadway shared with US 87 and MT 200, in a wrong-way concurrency.
US 191 continues north after going through Lewistown, crossing the Missouri River at the Charles M. Russell National Wildlife Refuge, and through Malta, where it shares a brief concurrency with US 2. It ends at the Canada–United States border at Morgan, where the road continues into Saskatchewan as Highway 4 toward Swift Current.

## History

The routing of US 191 has drastically changed through the years, with original route designated in 1926 ran from Idaho Falls, Idaho, to West Yellowstone concurrent with US 20, which existed until 1981 when US 191 rerouted to its current alignment through Wyoming, Utah, and Arizona.
On February 1, 1935, US 191 was extended over Montana Highway 187 (also known as the Gallatin Way) to Bozeman.
In 1996, US 191 was extended from Malta the Canadian border, absorbing former Montana Secondary Highway 242.

## Major intersections

| State | County | Location | mi | km | Exit | Destinations | Notes |
| Montana | Gallatin | Yellowstone National Park | −2.1 | −3.4 | | West Entrance Road | Continuation into Wyoming; US 20 resumes at Yellowstone National Park's East Entrance; US 191/US 287 resume at the park's South Entrance |
| Montana | Gallatin | Yellowstone National Park | 0.000 | 0.000 | | Yellowstone National Park West Entrance | Southern end of state maintenance of US 20/US 191/US 287 concurrency |
| Montana | Gallatin | West Yellowstone | 0.365 | 0.587 | | US 20 west (Firehold Avenue) – Idaho Falls | Northern end of US 20 concurrency |
| Montana | Gallatin | ​ | 8.722 | 14.037 | | US 287 north – Hebgen Lake, Ennis, Virginia City | Northern end of US 287 concurrency |
| Montana | Gallatin | Yellowstone National Park | 11.147 | 17.939 | Yellowstone National Park boundary | Yellowstone National Park boundary | Yellowstone National Park boundary |
| Wyoming | Park | Yellowstone National Park | 15.266– 20.722 | 24.568– 33.349 | No major junctions | No major junctions | No major junctions |
| Montana | Gallatin | Yellowstone National Park | 31.477 | 50.657 | Yellowstone National Park boundary | Yellowstone National Park boundary | Yellowstone National Park boundary |
| Montana | Gallatin | Big Sky Canyon | 48.191 | 77.556 | | MT 64 west (Lone Mountain Trail) – Big Sky | |
| Montana | Gallatin | Four Corners | 82.148 | 132.204 | | MT 84 west / MT 85 north – Norris, Belgrade | |
| Montana | Gallatin | Bozeman | 89.115 | 143.417 | | I-90 BL west (7th Avenue) | Southern end of I-90 BL concurrency |
| Montana | Gallatin | Bozeman | 89.803 | 144.524 | | MT 86 north (Rouse Avenue) – Bridger Bowl | |
| Montana | Gallatin | Bozeman | 90.930 | 146.338 | 309 | I-90 west – Butte | Northern end of I-90 BL concurrency; eastern terminus of I-90 BL; southern end of I-90 concurrency; exit numbers follow I-90 |
| Montana | Gallatin | ​ | 97.053 | 156.192 | 313 | Bear Canyon Road | |
| Montana | Gallatin | ​ | 100.374 | 161.536 | 316 | Trail Creek Road | |
| Montana | Gallatin | ​ | 103.274 | 166.203 | 319 | Jackson Creek Road | |
| Montana | Gallatin | ​ | 108.233 | 174.184 | 324 | Ranch Access | |
| Montana | Park | Livingston | 114.696 | 184.585 | 330 | I-90 BL east – Livingston | |
| Montana | Park | Livingston | 116.650 | 187.730 | 333 | US 89 south – Yellowstone National Park, Livingston City Center | Southern end of US 89 concurrency |
| Montana | Park | Livingston | 121.598 | 195.693 | 337 | I-90 BL west – Livingston | |
| Montana | Park | ​ | 124.128 | 199.765 | 340 | US 89 north – White Sulphur Springs | Northern end of US 89 concurrency |
| Montana | Park | ​ | 126.990 | 204.371 | 343 | Mission Creek Road | |
| Montana | Park | ​ | 134.154 | 215.900 | 350 | Eastern end Access | |
| Montana | Park | ​ | 136.408 | 219.527 | 352 | Ranch Access | |
| Montana | Sweet Grass | ​ | 138.015 | 222.114 | 354 | S-563 – Springdale | |
| Montana | Sweet Grass | ​ | 145.798 | 234.639 | 362 | De Hart | |
| Montana | Sweet Grass | Big Timber | 151.387 | 243.634 | 367 | I-90 east – Billings | Northern end of I-90 concurrency; western terminus of I-90 BL; southern end of I-90 BL concurrency |
| Montana | Sweet Grass | Big Timber | 152.542 | 245.493 | | S-298 south (McLeod Street) | |
| Montana | Sweet Grass | Big Timber | 152.771 | 245.861 | | I-90 BL east – Billings | Northern end of I-90 BL concurrency |
| Montana | Sweet Grass | ​ | 154.168 | 248.109 | | S-478 east | |
| Montana | Wheatland | Harlowton | 196.655 | 316.486 | | US 12 west – White Sulphur Springs | Southern end of US 12 concurrency |
| Montana | Wheatland | Harlowton | 198.041 | 318.716 | | US 12 east / MT 3 south / Nez Perce Trail – Billings | Northern end of US 12 concurrency; southern end of MT 3 concurrency |
| Montana | Wheatland | Judith Gap | 215.843 | 347.366 | | S-279 south | |
| Montana | Fergus | Eddies Corner | 237.274 | 381.855 | | US 87 north / MT 3 north / MT 200 west / Lewis and Clark Trail – Great Falls | Northern end of MT 3; southern end of US 87/MT 200 concurrency |
| Montana | Fergus | Lewistown | 251.609 | 404.925 | | US 87 south / MT 200 east / Lewis and Clark Trail – Lewistown | Northern end of US 87/MT 200 concurrency; western terminus of unsigned US 87 Byp.; southern end of US 87 Byp. concurrency |
| Montana | Fergus | Lewistown | 253.793 | 408.440 | | S-227 north (Joyland Road) | |
| Montana | Fergus | Lewistown | 254.548 | 409.655 | | Truck Bypass (US 87 Byp. south) to US 87 / MT 200 – Billings | Northern end of US 87 Byp. unsigned concurrency |
| Montana | Fergus | ​ | 257.017 | 413.629 | | S-426 (Hanover Road) | |
| Montana | Fergus | Brooks | 263.726 | 424.426 | | MT 81 west – Denton | |
| Montana | Fergus | Hilger | 269.068 | 433.023 | | S-236 north – Winifred | |
| Montana | Fergus | ​ | 297.065 | 478.080 | | MT 19 south – Grass Range | |
| Montana | Phillips | ​ | 332.852 | 535.673 | | MT 66 north / Nez Perce Trail – Harlem | |
| Montana | Phillips | Malta | 387.973 | 624.382 | | US 2 east (North 1st Street East) / Lewis and Clark Trail – Glasgow | Southern end of US 2 concurrency |
| Montana | Phillips | Malta | 388.177 | 624.710 | | US 2 west / Lewis and Clark Trail – Havre | Northern end of US 2 concurrency |
| Montana | Phillips | ​ | 411.591 | 662.392 | | S-208 north – Whitewater | |
| Montana | Phillips | Morgan | 442.161 | 711.589 | | Canadian border at the Morgan Border Crossing | Canadian border at the Morgan Border Crossing |
| Montana | Phillips | Morgan | 442.161 | 711.589 | | Highway 4 north – Swift Current | Continuation into Saskatchewan |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Tolled ||||||||