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- Bridges 49
- Rivers--Oregon 32
- Bays 6
- Bridges--Design and construction 5
- Cities and towns 4
- Roads 4
- Canyons 2
- Dams 2
- Footbridges 2
- Boats 1
- Covered bridges 1
- Fishing 1
- Floods 1
- Flumes 1
- Forests and forestry 1
- Formations (Geology) 1
- Harbors 1
- Log transportation 1
- Lumber trade 1
- Mills and mill-work 1