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- Power-plants 82
- Northwestern Electric Company 60
- Industrial buildings 59
- Factories 58
- Industrial equipment 45
- Hydroelectric power plants 19
- Rivers--Oregon 17
- Dams 13
- Hydroelectric power plant retirement 12
- Fishways 7
- Hydroelectric generators 3
- Turbine pumps 3
- Flumes 2
- Pittock Station (Portland, Oregon) 2
- Rivers--Washington (State) 2
- indoor portraits 2
- Canals 1
- Conveyor belts 1
- Covered bridges 1
- Forest products industry 1
