Lower Yellowstone Falls, Yellowstone National Park, Wyoming, United States

The Yellowstone River winds its way through Yellowstone National Park, including sections with crashing waterfalls and areas of calm, lazy flow. As the only undammed river in the lower 48 states, it courses 692 miles through Wyoming, Montana and North Dakota.

The three most dramatic waterfalls along the Yellowstone River occur in Yellowstone National Park. Once the river leaves Yellowstone Lake, it plunges 109 feet at the Upper Falls and then another 308 feet at the spectacular Lower Falls down into the Grand Canyon of the Yellowstone. Upon leaving the canyon, the river cascades down another 132 feet at Tower Falls.