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- West (U.S.) 28
- Bodies of water 27
- Canals--Design and construction--Costs 27
- Dams--Design and construction 27
- Transportation 26
- Northwest, Pacific 25
- Rivers 25
- Water resources development 25
- River engineering 6
- United States--Appropriations and expenditures 6
- Locks (Hydraulic engineering) 2
- Railroad engineering 2
- River surveys 2
- Bridges--Design and construction 1
- Cascade Range 1
- Railroad construction & maintenance 1
- United States. Congress--Records and correspondence 1