Driftwood Outdoors: Yellowstone River is an example of changing biodiversity
The Yellowstone River is the longest undammed river in the United States. It originates at 12,800 feet above sea level in the Absaroka Mountains of Wyoming. Then it flows north into Montana, turns east at Livingston, and by the time it reaches the Missouri River in the plains of western North Dakota, the river has descended 11,000 feet to a mere 1,800 feet above sea level.