Pacific Northwest Stream Survey
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Topic
- Rivers--Oregon 218
- Dams 120
- Fishways 36
- Canals 16
- Salmon 16
- Hydroelectric power plants 13
- Rivers--Idaho 13
- Power-plants 9
- Sawmills 9
- Fish hatcheries 8
- Rivers--Washington (State) 8
- Waterfalls 8
- Pack animals (Transportation) 7
- Canyons 6
- Forests and forestry 5
- Lumber trade 5
- Mountains 5
- Rapids 5
- Salmon fisheries 5
- Salmon--Artificial spawning 5