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- Rapids 102
- Waterfalls 35
- Rivers 23
- Columbia River 18
- Bridge of the Gods (Or. and Wash. : Natural bridge) 13
- Mountains 13
- Oregon, Eastern 12
- Forests and forestry 11
- Rivers--Oregon 10
- Iron and steel bridges 9
- Klickitat River (Wash.) 9
- Landscape photography 9
- Columbia River Watershed 8
- Celilo Falls (Wash.) 7
- Trees 7
- Bodies of water 6
- Indians of North America 6
- John Day River (Or.) 6
- Nature 6
- Northwest, Pacific 6