Defenders of the Colter’s Hell mythology are eager to challenge Washington Irving as an authority. True, Irving’s Captain Bonneville by his own admission never personally saw the Yellowstone Park area. Also, it is true that geysers are not to be seen today along the Shoshone River. Hence it might be reasoned that the only noteworthy thermal activity in 1807 was likewise confined to the Yellowstone (more particularly, to the upper Madison), and that Bonneville was merely reporting a twisted rumor. But a cold examination of the facts shows that Irving and Bonneville were correct. [Illustration: Colter Monument. Photo by Author] First, there is no good reason to question Bonneville’s geographical knowledge. While he never saw it himself, Bonneville had quite a crew circulating through the future park as early as 1833 and, in fact, there is reason to believe that the great geyser basin of Firehole River, climaxed by Old Faithful, was discovered that year by one of his own lieutenants (see Chapter VII). Secondly, although there are no phenomena readily apparent to passing motorists at the bona fide and unmarked Colter’s Hell site just west of Cody, the evidence of thermal activity, not entirely extinct now, is abundantly evident to anyone who cares to pause enroute to or from Yellowstone’s East Gate. On the Canyon rim downstream from the rocky defile enclosing the Buffalo Bill Dam, there are extinct geyser cones up to thirty feet in height and an extensive crust of fragile sinter. In the canyon floor itself there are bubbling fountains in the river bed, and the same pervasive smell of rotten eggs, (or more scientifically, sulphur dioxide) which assails one’s nostrils on the Upper Firehole. (Other related hot springs once existed at the forks of the Shoshone, now drowned beneath the reservoir). [Illustration: Colter Stone Find Site (Wyoming). Photo by Author] How very strange that this spot, quite evidently the “Boiling Spring” of Colter’s famous route on the William Clark Map of 1810, has been largely ignored since 1895. Campfire writers and lecturers have been so enchanted by the Yellowstone “Wonderland,” they never gave thought to this historical-geological feature 50 miles outside of the Park boundary.