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- Dams 109
- Rivers 52
- Northwest, Pacific 28
- Bodies of water 24
- Aerial photographs 23
- Dams--Design and construction 22
- Hydraulic structures 20
- Water-power 12
- Building 10
- Photography 10
- Concrete dams 9
- Hydroelectric power plants 9
- Grande Ronde River (Or. and Wash.) 6
- Trees 6
- Umatilla River (Or.) 6
- Construction equipment 5
- Dinghies 5
- Electric utilities 5
- Energy industries 5
- Irrigation canals and flumes 5