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- Dams 103
- Rivers--Washington (State) 100
- Rivers--Oregon 49
- Fish traps 28
- Fishways 26
- Chinook salmon 16
- Fishing boats 16
- Salmon 14
- Seining 14
- Spillways 7
- Waterfalls 7
- Fish stocking 4
- Rivers 4
- Steam-engines 4
- Automobiles 3
- Boats 3
- Canyons 3
- Fish hatcheries 3
- Fishing 3
- Hoisting machinery 3