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- Dams 71
- Rivers--Idaho 63
- Rivers--Oregon 54
- Rivers--Washington (State) 31
- Waterfalls 21
- Rivers 20
- Fishways 15
- Lakes 15
- Mountains 11
- Valleys 10
- Fish weirs 6
- Canyons 5
- Fish hatcheries 4
- Steam-engines 4
- Bridges 3
- Canals 2
- Rapids 2
- Spawning 2
- Watersheds 2
- Boats 1