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- Bodies of water 1
- Railroad engineering 1
- River engineering 1
- United States--Appropriations and expenditures 1
Region
- Canoe Encampment Rapids (historical) >> Morrow County >> Oregon >> United States 1
- Celilo Canal >> Wasco County >> Oregon >> United States 1
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 1
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 1
- Clatskanie River >> Columbia County >> Oregon >> United States 1
- Columbia River >> Clatsop County >> Oregon >> United States 1
- Coquille River >> Coos County >> Oregon >> United States 1
- Corvallis >> Benton County >> Oregon >> United States 1
- Cowlitz River >> Cowlitz County >> Washington >> United States 1
- Deschutes River >> Sherman County >> Oregon >> United States 1
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