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- Dams 34
- Rivers--Washington (State) 24
- Fish weirs 13
- Rivers--Idaho 13
- Rivers--Oregon 9
- Fish traps 5
- Fish stocking 3
- Hoisting machinery 3
- Waterfalls 3
- Canyons 2
- Chinook salmon 2
- Lakes 2
- Rivers 2
- Valleys 2
- Fishways 1
- Islands--Oregon 1
- Logging, Skyline 1
- Power-plants 1
- Rafts 1
- Rapids 1