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- Waterfalls 49
- Bridges 19
- Multnomah Falls (Or.) 18
- Footbridges 9
- Photography 8
- Columbia River Highway (Or.) 6
- Northwest, Pacific 6
- Rivers 5
- Rocks 5
- Trees 5
- Automobiles 4
- Formations (Geology) 4
- Nature 4
- Bodies of water 3
- Forests and forestry 3
- Tourists 3
- Columbia River Gorge (Or. and Wash.) 2
- Columbia River Valley 2
- Discovery and exploration 2
- Explorers 2
