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West Yellowstone to I-90


Twotoes

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I will be visiting West Yellowstone in a couple of weeks and then heading to Custer SD. I see that there are two routes to take to get to I-90 from West Yellowstone. I will be pulling a 42 foot toy hauler. One route is taking highway 191. The other route is highway 287. Has anyone taken either of these routes in an RV? Also what would it be like just going east thru Yellowstone National Park to Cody and continue to Custer over the Bighorn? Thanks is advance for your replies.

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We have done all three of the routes you mention towing the trailer. For the Bighorn route, I would suggest US-16 over the other possibilities (US-14 or US-14A). We have also taken two other routes. US-89 North from the North Entrance (Mammoth/Gardner) and WY-120/MT-72, US-310/212 from Cody. Consult the Mountain Directory for descriptions of the grades on each route. Depending on when you will be leaving the Yellowstone area, you will also need to check on what park roads are open.

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You don't say what your are towing your huge 42' toy hauler with. If you are at or over your GCVW be very careful about towing over the Bighorn. It is pretty steep.

I am towing with a 2012 Ford F-350 6.7L Diesel. I have done the Bighorn once and it was a little challenging. Since I will be on the west side of Yellowstone I thought rather than tow thru the park I would head north to I-90. Not sure which is better 191 or 287.

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...Since I will be on the west side of Yellowstone I thought rather than tow thru the park I would head north to I-90. Not sure which is better 191 or 287...

I don't recall much difference as far as grades go. In general, North/South routes in that region run in the valleys between the mountains while the East/West routes cross the mountains. Going Eastbound on I-90 to the Dakotas, US-191 will be the shorter route. The most difficult part of the US-89 route is inside the park with grades between Norris and Mammoth and Mammoth and Gardner.

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You will be fine on Rt. 191 from West Yellowstone, MT. into Bozeman. Very scenic, sometimes slows around Big Sky. When getting into what is locally known as Four Corners, go straight thru to I-90 (Belgrade). Bozeman is a PITA to tow thru in my opinion. At Four Corners on the northwest corner is a huge Town Pump c-store with a large parking area. There is a free dump station in the lot. Most Town Pumps are very RV friendly with free dump stations. We use RT. 191 from West Yellowstone to I-90 ourselves with a dually crew cab and 39' fiver. When leaving West beware of wildlife at anyplace and time.

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