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As it turns out, the Lang Creek Brewery is, oh, lets say, 15 miles WEST of Marion. The only way I "found" it is that they have sign by the road. You pull off the highway and then go two miles south on a rutted road and the left on a (more) dirt road to see:
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This is the tap room. It may be the smallest tap room of any brewery in Montana - there are only three stools and two tables.
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I can't tell you how the beer was because I was in a car that wasn't mine and couldn't taste.
But I'll be back.