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Region
- Columbia River >> Douglas County >> Washington >> United States 6
- Oregon >> United States 5
- Washington >> United States 5
- Bonneville Dam >> Multnomah County >> Oregon >> United States 2
- Grand Coulee Dam >> Okanogan County >> Washington >> United States 2
- Idaho >> United States 2
- Snake River >> Franklin County >> Washington >> United States 2
- Willamette River >> Multnomah County >> Oregon >> United States 2
- Flathead River >> Sanders County >> Montana >> United States 1
- Montana >> United States 1
- Santiam River >> Marion County >> Oregon >> United States 1
- Skagit River >> Skagit County >> Washington >> United States 1
- Yakima River >> Benton County >> Washington >> United States 1
