Limit your search
Topic
- Fishways 44
- Rivers--Oregon 44
- Dams 39
- Hydroelectric power plants 7
- Power-plants 6
- Salmon 2
- Canals 1
- Fishes--Conservation 1
- Flumes 1
- Lumber trade 1
- more »
Region
- Willamette River >> Multnomah County >> Oregon >> United States 44
- Yamhill County >> Oregon >> United States 13
- Yamhill River >> Yamhill County >> Oregon >> United States 13
- Linn County >> Oregon >> United States 11
- Clackamas County >> Oregon >> United States 6
- Marion County >> Oregon >> United States 6
- Santiam River >> Marion County >> Oregon >> United States 6
- Clackamas River >> Clackamas County >> Oregon >> United States 5
- North Yamhill River >> Yamhill County >> Oregon >> United States 5
- South Yamhill River >> Yamhill County >> Oregon >> United States 5
- more »
Institution
- Oregon State University 44