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- Locks (Hydraulic engineering) 31
- Waterways 24
- Steamboats 17
- Boats and boating 10
- Rivers 10
- River boats 8
- River steamers 8
- Ships 8
- Passenger ships 6
- Rivers--Oregon 6
- Anniversaries 2
- Bonneville Dam (Or. and Wash.) 2
- Cascade Locks (Or.) 2
- Columbia River Highway (Or.) 2
- Crowds 2
- Docks 2
- Public works 2
- Special events 2
- Willamette River (Or.) 2
- Boats 1
