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- Bodies of water 6
- Bridges--Design and construction 6
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- River engineering 6
- River surveys 6
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- United States. Congress--Records and correspondence 6
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- Columbia River >> Douglas County >> Washington >> United States 6
- Oregon >> United States 6
- Snake River >> Franklin County >> Washington >> United States 6
- Washington >> United States 6
- Willamette River >> Multnomah County >> Oregon >> United States 6
- Coos Bay >> Coos County >> Oregon >> United States 4
- Nehalem River >> Tillamook County >> Oregon >> United States 2
- Clearwater River >> Nez Perce County >> Idaho >> United States 1
- Cowlitz River >> Cowlitz County >> Washington >> United States 1
- Idaho >> United States 1
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