John Colter - Yellowstone, Grand Teton and Jackson Hole

Yellowstone, Grand Teton and Jackson Hole

Colter left Fort Raymond in October 1807, and over the course of the winter, he explored the region that later became Yellowstone and Grand Teton National Parks. Colter reportedly visited at least one geyser basin, though it is now believed that he most likely was near present-day Cody, Wyoming, which at that time may have had some geothermal activity to the immediate west. Colter probably passed along portions of the shores of Jackson Lake after crossing the Continental Divide near Togwotee Pass or more likely, Union Pass in the northern Wind River Range. Colter then explored Jackson Hole below the Teton Range, later crossing Teton Pass into Pierre's Hole, known today as the Teton Basin in the state of Idaho. After heading north and then east, he is believed to have encountered Yellowstone Lake, another location in which he may have seen geysers and other geothermal features. Colter then proceeded back to Fort Raymond, arriving in March or April 1808. Not only had Colter traveled hundreds of miles, much of the time unguided, he did so in the dead of winter, in a region in which nighttime temperatures in January are routinely −30 °F (−34 °C).

Colter arrived back at Fort Raymond and few believed his reports of geysers, bubbling mudpots and steaming pools of water. His reports of these features were often ridiculed at first, and the region was somewhat jokingly referred to as "Colter's Hell". The area Colter described is now widely believed to be immediately west of Cody, Wyoming, and though little thermal activity exists there today, other reports from around the period when Colter was there also indicate observations similar to those Colter had originally described. His detailed exploration of this region is the first by a white man of what later became the state of Wyoming.