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

    Comments:From exit go east to 6th St NW and then north to Northwest Bypass
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

    Comments: There is no charge for use of RV dump but donations are accepted. City park also has free overnight parking, water, and restrooms with flush toilets.
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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