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- Rivers--Oregon 78
- Waterfalls 35
- Dams 11
- Sawmills 6
- Rapids 4
- Coarse woody debris 3
- Fishways 3
- Springs 3
- Bridges 2
- Flumes 2
- Forests and forestry 2
- Hydroelectric power plants 2
- Lumber trade 2
- Power-plants 2
- Logging--Machinery 1
- Rivers 1
- Rowboats 1
- Salmon 1