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Spatial Coverage
- Montana4
- Yellowstone River4
- Colorado River (Colo.-Mexico)3
- Arizona2
- Dolores River (Colo. and Utah)2
- Grand Canyon2
- Grand Canyon (Ariz.)2
- Oregon2
- Colorado River.1
- Grand Canyon.1
- Green River1
- Green River (Utah)1
- Hells Canyon (Idaho and Or.)1
- Idaho1
- McKenzie River1
- McKenzie River (Or.)1
- North America1
- Rogue River1
- Rogue River (Or.)1
- Rogue River.1
