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- Riparian areas 82
- Northwest, Pacific 71
- Bodies of water 67
- Rivers 67
- Photography 64
- Mountains 32
- Formations (Geology) 14
- Steamboats 10
- Boats and boating 8
- Fishers 8
- Postcards 8
- Railroads 6
- Fishing 5
- Floods 5
- Harbors 5
- Rapids 5
- River engineering 5
- Scenic byways 5
- United States. Congress--Records and correspondence 5
- Waterfalls 5