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- Architecture, American 21
- Architecture--United States 21
- Rivers--Oregon 5
- Bridges 2
- Fishing 2
- Forests and forestry 2
- River engineering 2
- River surveys 2
- United States--Appropriations and expenditures 2
- Alcidae 1
- Aves 1
- Beer 1
- Boats 1
- Canals--Design and construction--Costs 1
- Coastal plants 1
- Dams--Design and construction 1
- Estuaries--Oregon 1
- Fishers 1
- Hops 1
- Locks (Hydraulic engineering) 1