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Topic
- Fishways 37
- Rivers--Oregon 35
- Dams 34
- Hydroelectric power plants 5
- Power-plants 5
- Spillways 3
- Rivers--Washington (State) 2
- Salmon 2
- Canals 1
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 34
- Yamhill County >> Oregon >> United States 13
- Yamhill River >> Yamhill County >> Oregon >> United States 13
- Linn County >> Oregon >> United States 8
- Marion County >> Oregon >> United States 6
- Santiam River >> Marion County >> Oregon >> United States 6
- North Yamhill River >> Yamhill County >> Oregon >> United States 5
- South Yamhill River >> Yamhill County >> Oregon >> United States 5
- Tualatin River >> Clackamas County >> Oregon >> United States 5
- Willamina Creek >> Yamhill County >> Oregon >> United States 5
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Decade
- 1940-1949 37
