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- Architecture, American 9
- Architecture--United States 8
- United States--Appropriations and expenditures 6
- West (U.S.) 6
- River engineering 5
- Rivers--Oregon 3
- Railroad engineering 2
- Architecture 1
- Bodies of water 1
- Croplands 1
- Dams--Design and construction 1
- Hops 1
- Locks (Hydraulic engineering) 1
- Log transportation 1
- Lumber trade 1
- Mills and mill-work 1
- Paper industry 1
- Sawmills 1
- Transportation 1
- Waterfalls 1