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- Rivers--Oregon 62
- Waterfalls 35
- Fishing 26
- Floods 12
- Cities and towns 11
- Formations (Geology) 7
- Agriculture 2
- Barges 2
- Bridges 2
- Fishwheels 2
- Indians of North America 2
- Locks (Hydraulic engineering) 2
- Mountains--Oregon 2
- Railroad tracks 2
- Ships 2
- Bridges--Design and construction 1
- Canals 1
- Canneries 1
- Canyons 1
- Children 1