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- Hydroelectric power plants 43
- Dams 23
- Power-plants 19
- Rivers--Oregon 18
- Factories 12
- Hydroelectric power plant retirement 12
- Industrial buildings 12
- Northwestern Electric Company 12
- Water-power 12
- Fishways 7
- Spillways 4
- Hydroelectric generators 3
- Turbine pumps 3
- Cranes, derricks, etc 2
- Flumes 1
- Marquees 1
- Motion picture theaters 1
- River engineering 1
- Rivers 1
- Salmon 1
