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- River engineering 3
- United States--Appropriations and expenditures 3
- Bodies of water 2
- Railroad engineering 2
- Bridges--Design and construction 1
- Canals--Design and construction--Costs 1
- Cascade Range 1
- Dams--Design and construction 1
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Region
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 3
- Columbia River >> Clatsop County >> Oregon >> United States 3
- Corvallis >> Benton County >> Oregon >> United States 3
- Cowlitz River >> Cowlitz County >> Washington >> United States 3
- Portland >> Clackamas County >> Oregon >> United States 3
- Priest Rapids >> Kittitas County >> Washington >> United States 3
- Snake River >> British Columbia >> Canada 3
- Vancouver >> Clark County >> Washington >> United States 3
- Willamette River >> Multnomah County >> Oregon >> United States 3
- Yamhill River >> Yamhill County >> Oregon >> United States 3
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