Colter's Hell is the single best place on the route to correct a piece of nineteenth-century conflation that still surfaces in modern tourism copy. The sulfur springs and fumaroles Colter described to William Clark in 1810 were here, on the Shoshone River just west of Cody — not in the Yellowstone geyser basins. USGS confirms the Cody hydrothermal field is geologically unrelated to the Yellowstone caldera. Naming that, plainly, in the public copy is part of the build.
The Shoshone canyon — including the hydrothermal area at Colter's Hell — was a known landscape to Eastern Shoshone and seasonally other tribes (Crow, Bannock) long before any non-Native description of it. The Shoshone name for the area was not 'Colter's Hell.'
For nineteenth-century trappers, sulfur springs and fumaroles were practical landmarks — water sources to avoid, mud to read, country to remember on the way through. The country around the modern town of Cody was a transit zone between the plains-edge trade at Fort Raymond and the higher trapping country further west and south.
Around May 1810, in St. Louis, Colter described his 1807-08 traverse to William Clark, who annotated a manuscript map with the route. Colter's verbal account of sulfur springs and 'burning ground' was relayed by Clark and later writers — Bradbury, James, Brackenridge — as a kind of regional wonder.
Nineteenth-century writers conflated his description with the geyser basins to the west, and 'Colter's Hell' came to mean 'Colter discovered Yellowstone's geysers.' He did not. The USGS Yellowstone Volcano Observatory states this directly: the Cody hydrothermal field is geologically distinct from the Yellowstone caldera, and what Colter described is what's here on the Shoshone.
The map and this profile say so explicitly. The conflation is not perpetuated.
We do not know precisely which features in the modern Cody hydrothermal field were active in 1807-08; the area's thermal output has changed substantially over two centuries. We do not know whether Colter actually used the words 'hell' or whether the name attached later via Bradbury and others. The most-quoted line ('a place where the earth is filled with sulfur') comes from Clark's relay, not Colter's hand.
The Colter's Hell interpretive area is on the western edge of Cody, on US-14/16/20 (the Buffalo Bill Cody Scenic Byway) just before the climb up the South Fork toward the East Yellowstone gate. The Buffalo Bill Center of the West in Cody — five museums under one roof — is the regional scholarly anchor and the natural co-author for this profile.
Phase 3 target: 360° capture at the Shoshone canyon interpretive overlook, with Buffalo Bill Center co-author audio if the partnership lands. The Center published an extensive Colter feature in January 2026.
Sources & attribution: USGS Yellowstone Volcano Observatory · Buffalo Bill Center of the West · Merrill J. Mattes (NPS, 1962) · Wikipedia Colter's Hell