Interstate 90 by FlaxmanR

Question 2

Just after mile marker 279 in Montana, I-90 crosses the Madison River; about 1.5 miles northwest of that, it crosses the Jefferson River. If one were to get off at exit 278, it would only take about five minutes to drive to the point a couple miles north of the interstate where the Madison and Jefferson converge to form what other river?

MISSOURI RIVER

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