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- Dams--Design and construction 3
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Region
- Astoria >> Clatsop County >> Oregon >> United States 3
- Columbia River >> Clatsop County >> Oregon >> United States 3
- Willamette River >> Multnomah County >> Oregon >> United States 3
- Yamhill River >> Yamhill County >> Oregon >> United States 3
- Cascade Locks >> Hood River County >> Oregon >> United States 2
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 2
- Cowlitz River >> Cowlitz County >> Washington >> United States 2
- Lewiston >> Nez Perce County >> Idaho >> United States 2
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- 1890-1899 3
