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- Rivers--Oregon 329
- Waterfalls 55
- Fishing 36
- Bridges 32
- Cities and towns 23
- Coarse woody debris 22
- Dams 19
- Forests and forestry 19
- Lumber trade 16
- Canyons 15
- Mountains--Oregon 14
- Log transportation 13
- Floods 12
- Formations (Geology) 11
- Railroad tracks 10
- Forest fires 8
- Boats 7
- Railroad bridges 7
- Riparian areas--Management 7
- Footbridges 6