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- Rivers--Oregon 346
- Dams 147
- Fishways 35
- Salmon 31
- Flood control 28
- Fishes--Conservation 17
- Water--Pollution 17
- Canals 16
- Bridges 13
- Cities and towns 13
- Hydroelectric power plants 13
- Waterfalls 12
- Floods 10
- Boats 9
- Canyons 9
- Fish hatcheries 9
- Power-plants 9
- Sawmills 9
- Forests and forestry 8
- Lumber trade 7