Interstate 15 North - Shelby to Sweet Grass

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Interstate 15 lowers to cross the Marias River north of mile marker 356.
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The East Butte and West Butte of the Sweet Grass Hills appear far to the east.
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The Sweet Grass Hills rise nearly 3,000 feet above the level of the surrounding plains.
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Middle Butte, East Butte and West Butte. West Butte is the closest and highest to Sweet Grass.
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The north end of Interstate 15 leads into the port of entry for Canada.
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The Canadian Customs station at the north end of Interstate 15.
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