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Topic
- Dams 6
- Spillways 6
- Rivers--Washington (State) 5
- Fishways 3
- Fish traps 2
- Rivers--Oregon 1
Region
- Chelan County >> Washington >> United States 5
- Columbia River >> Clatsop County >> Oregon >> United States 5
- Columbia River >> Douglas County >> Washington >> United States 5
- Clackamas County >> Oregon >> United States 1
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Willamette River >> Multnomah County >> Oregon >> United States 1
Decade
- 1930-1939 6
