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- Bodies of water 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Canals 9
- River channels 9
- River engineering 9
- River surveys 9
- Rivers 9
- United States. Congress--Records and correspondence 9
- Northwest, Pacific 8
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Region
- Columbia River >> Douglas County >> Washington >> United States 10
- Oregon >> United States 10
- Washington >> United States 10
- Snake River >> Franklin County >> Washington >> United States 9
- Willamette River >> Multnomah County >> Oregon >> United States 9
- Coos Bay >> Coos County >> Oregon >> United States 4
- Idaho >> United States 2
- Yamhill River >> Yamhill County >> Oregon >> United States 2
- Buster Creek >> Clatsop County >> Oregon >> United States 1
- Clearwater River >> Nez Perce County >> Idaho >> United States 1
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