“Old Faithful was named by the first official expedition to Yellowstone, the Washburn Expedition of 1870. They were impressed by its size and frequency. Old Faithful erupts every 35 to 120 minutes for 1 1/2 to 5 minutes. Its maximum height ranges from 90 to 184 feet.” - (info from Yellowstone.net)
A bison jam on a bridge over the Yellowstone River. The bison of Yellowstone's Northern Range Herd slowly migrate from their summer range in Lamar Valley and adjacent high elevation meadows, to lower elevation winter forage near Mammoth and Gardiner.