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- Roads 807
- Rivers 142
- Bridges 113
- Automobiles 102
- Forests and forestry 88
- Trees 87
- Buildings 81
- Mountains 72
- Columbia River Highway (Or.) 57
- Cliffs 51
- Forest roads 48
- Landscapes 45
- Tunnels 37
- Dirt roads 35
- Cities and towns 32
- Aerial photography 27
- Columbia River Gorge (Or. and Wash.) 22
- Mountains--Oregon 21
- Signs and signboards 21
- Rocks 20
