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- Rivers--Washington (State) 18
- Dams 16
- Fish traps 5
- Rivers--Oregon 5
- Hoisting machinery 3
- Chinook salmon 2
- Fish stocking 2
- Canyons 1
- Fishways 1
- Islands--Oregon 1
- Power-plants 1
- Spillways 1
- Trucks 1
- Waterfalls 1