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- Footbridges 58
- Celilo Falls (Wash.) 17
- Bridges 14
- Waterfalls 14
- Landscapes 9
- Indians of North America 7
- Rivers 7
- Trees 7
- Forests and forestry 6
- Rocks 5
- Access denial (Military science) 4
- Bodies of water 4
- Defensive (Military science) 4
- Fishwheels 4
- Hood River Watershed (Or.) 4
- Palaces 4
- Stone walls 4
- Uplands 4
- Men 3
- Pagodas 3
