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- Locks (Hydraulic engineering) 37
- Waterways 24
- Steamboats 20
- Rivers 14
- Boats and boating 10
- River boats 8
- River steamers 8
- Ships 8
- Passenger ships 6
- Rivers--Oregon 6
- Bodies of water 4
- Northwest, Pacific 4
- Photography 4
- Anniversaries 2
- Bonneville Dam (Or. and Wash.) 2
- Cascade Locks (Or.) 2
- Columbia River Highway (Or.) 2
- Crowds 2
- Docks 2
- Mountains 2
