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Topic
- Rivers--Oregon 218
- Dams 120
- Fishways 36
- Canals 16
- Salmon 16
- Hydroelectric power plants 13
- Rivers--Idaho 13
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 174
- Linn County >> Oregon >> United States 80
- Marion County >> Oregon >> United States 57
- Santiam River >> Marion County >> Oregon >> United States 48
- Clackamas County >> Oregon >> United States 22
- Yamhill County >> Oregon >> United States 22
- Yamhill River >> Yamhill County >> Oregon >> United States 22
- Columbia River >> Clatsop County >> Oregon >> United States 20
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- Calapooia River >> Linn County >> Oregon >> United States 17
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Rights
- In Copyright 271
Format
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Collection
- Pacific Northwest Stream Survey 271
Decade
- 1940-1949 271