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- Footbridges 118
- Waterfalls 32
- Bridges 20
- Celilo Falls (Wash.) 17
- Rivers--Oregon 17
- Forests and forestry 10
- Landscapes 9
- Dwellings 8
- Indians of North America 7
- Rivers 7
- Rivers--Washington (State) 7
- Trees 7
- Rocks 5
- Springs 5
- Access denial (Military science) 4
- Bodies of water 4
- Defensive (Military science) 4
- Fishwheels 4
- Hood River Watershed (Or.) 4
- Palaces 4
