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- River engineering 7
- United States--Appropriations and expenditures 7
- West (U.S.) 4
- Bodies of water 1
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Region
- Clatskanie River >> Columbia County >> Oregon >> United States 7
- Columbia River >> Clatsop County >> Oregon >> United States 5
- Cowlitz River >> Cowlitz County >> Washington >> United States 5
- Portland >> Clackamas County >> Oregon >> United States 4
- Grays River >> Wahkiakum County >> Washington >> United States 2
- Willamette River >> Multnomah County >> Oregon >> United States 2
- 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
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