| Clue | Source | Date |
|---|---|---|
| It flows through Idaho Falls | Newsday | 10 Sep 2020 |
| Part of Oregon's border | Newsday | 05 Mar 2017 |
| Part of Oregon's border | LA Times Daily | 29 Jan 2016 |
| Part of Oregon's border | ||
| Carver of Hells Canyon | ||
| Columbia tributary that forms part of the Idaho-Oregon border | ||
| It runs through southern Idaho | ||
| It starts in Yellowstone National Park | ||
| Knievel once tried to jump across it | ||
| Site of a Knievel jump |