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- Bodies of water 13
- River engineering 13
- Rivers 13
- United States. Congress--Records and correspondence 13
- Harbors 12
- River surveys 12
- West (U.S.) 11
- River channels 8
- Rapids 3
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- California >> United States 13
- Columbia River >> Douglas County >> Washington >> United States 13
- Oregon >> United States 13
- Washington >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 13
- Snake River >> Franklin County >> Washington >> United States 8
- San Francisco Bay >> San Mateo County >> California >> United States 7
- San Diego River >> San Diego County >> California >> United States 6
- Coos Bay >> Coos County >> Oregon >> United States 5
- Clearwater River >> Nez Perce County >> Idaho >> United States 3
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