Montana Interstate 15
Interstate 15 in Montana runs north to south for 398 miles from the United States/Canada border to the Idaho state line. A portion of it is also shared with I-90. Northbound travelers should read up the chart. Southbound travelers read down the chart.
| Exit(mm) | Description |
| 339 | I-15 Bus / Main St / Conrad |
| Cenex gas station on Main St in center of town, no fee. | |
| 290 | US 89 / MT 200 / Vaughn |
| Valley Country Store at 133 US 89, no fee | |
| 280 | Central Ave W / Great Falls |
Holiday Stationstore, 601 Northwest Bypass, free
|
|
| 278 | US 89 / Country Club Blvd / Great Falls |
| Holiday Stationstore, 1601 Fox Farm Rd, free | |
| Sinclair service station on Fox Farm Rd. Free with fuel purchase. Propane also available. | |
| 277 | 31st St SW / Great Falls |
| Flying J Travel Plaza, 3715 31st St SW, 406-761-0052, Free. There are two dump stations. If you pull into the pumps at the right, you will be set up to dump while you fuel. Latitude: 47.4694 | Longitude: -111.3583 |
|
| 200 | Lincoln Rd / Helena |
| Lincoln Road RV Park about one mile west of exit, $5 | |
| 197 | Cedar St / Helena |
| Kum & Go gas station at Custer Ave and N Montana Ave, no charge. From exit, go west to N Montana St; go north to Custer Ave. Dump station is entered at northwest corner of station lot. | |
| 192 | US 12 / US 287 / Helena |
| High Country Travel Plaza | |
| 164 | MT 69 / Boulder |
Boulder City Park on Main St
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| I-15 and I-90 run together / follows I-15 numbering | |
| 127 | US 10 / Harrison Ave / Butte |
| Town Pump (Exxon), 3700 Harrison Ave, 406-494-2434, $2. Latitude: 45.9679 | Longitude: -112.5076 |
|
| I-15 and I-90 run together / follows I-15 numbering | |
| 63 | I-15 Bus Route / Dillon |
| Rocky Mountain Supply (Cenex station), 700 N Montana St, $5 or free with $10 purchase. | |
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