The Lower Falls of the Yellowstone River is the tallest waterfall in Yellowstone National Park, falling 308 feet at the head of the Grand Canyon of the Yellowstone. It is the most famous and photographed waterfall in the park, with views from both sides of the canyon2. It can be seen throughout the year, but the best time to visit is in the spring, summer, or fall. It is one of the largest volume waterfalls in the Rocky Mountains within the United States.