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Topic
- Rivers--Oregon 264
- Fishing 43
- Bridges 22
- Canyons 16
- Dams 16
- Forests and forestry 13
- Waterfalls 13
- Railroad tracks 11
- Dwellings 10
- Formations (Geology) 10
- Lumber trade 10
- Boats 9
- Locks (Hydraulic engineering) 9
- Log transportation 8
- Paddle steamers 7
- Canoes and canoeing 6
- Ferries 6
- Passenger ships 6
- Steamboats 6
- Waterways 6
