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- Spillways 40
- Dams 21
- Rivers--Oregon 11
- Hydroelectric power plants 10
- Rivers--Washington (State) 8
- Fishways 7
- Iron and steel bridges 6
- Spokane Falls (Wash. : Waterfall) 6
- Rivers--Idaho 5
- Dams--Idaho 4
- Fish hatcheries 4
- Water-power 4
- Fish traps 2
- Washington Water Power Company 2
- Farm buildings 1
- Farmhouses 1
- Fish screens 1
- Photography, Stereoscopic 1