Yellowstone River

The Yellowstone River is the last major undammed river in the lower 48 states, flowing 671 miles from its source southeast of Yellowstone into the Missouri River and then, eventually, into the Atlantic Ocean. It begins in the Absaroka Mountain ...

Upper Falls of the Yellowstone River

A waterfall is a clue that you are standing on a geologic crossroads.

A waterfall forms in a river channel where harder rocks meet softer rocks that erode more easily and quickly. Here, volcanic and hydrothermal activity have created the 109-foot ...

Along the Yellowstone River

Gallatin National Forest

A Blue Ribbon Flowing Through Paradise

The Yellowstone is the longest free-flowing river in the lower 48 states. For the 103 miles downstream from Gardiner, the river is designated as a "Blue Ribbon" trout stream, the longest single ...