Boulder River (south central Montana)
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The Boulder River is a tributary of the Yellowstone River, approximately 60 mi (96 km) long, in south central Montana in the United States. It is one of two rivers named the Boulder River in Montana.
It rises in the Gallatin National Forest in the Absaroka Range in southern Park County. It flows north through mountainous canyons, a natural bridge, and northwest in a widening valley past McLeod. It joins the Yellowstone at Big Timber.
The river is a popular destination for fly fishing.