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- Covered bridges 22
- Bridges 18
- Rivers 14
- Roads 12
- Trees 5
- Drawbridges 4
- John Day River (Or.) 4
- Rivers--Oregon 4
- Dams 1
- Dirt roads 1
- Diversion structures (Hydraulic engineering) 1
- Fishing boats 1
- Flour mills 1
- Tree trunks 1
- Water-power 1