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- Canyons 82
- Rivers--Oregon 35
- Rivers--Washington (State) 12
- Rivers--Idaho 9
- Rivers 8
- Bridges 7
- Formations (Geology) 4
- Roads 4
- Deschutes River (Or.) 3
- Forests and forestry 3
- Railroad tracks 3
- Dams 2
- Geology--Oregon 2
- Pack animals (Transportation) 2
- Aerial photographs 1
- Basalt 1
- Firearms 1
- Footbridges 1
- Forest fires 1
- Horses 1
