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- Bodies of water 13
- River engineering 13
- River surveys 13
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- United States. Congress--Records and correspondence 13
- River channels 12
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- Canals 6
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Region
- Columbia River >> Douglas County >> Washington >> United States 13
- Coos Bay >> Coos County >> Oregon >> United States 13
- Snake River >> Franklin County >> Washington >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 13
- Oregon >> United States 12
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- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Idaho >> United States 6
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