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- Bodies of water 6
- River engineering 6
- Canals--Design and construction--Costs 5
- Dams--Design and construction 5
- West (U.S.) 5
- Government publications 4
- Northwest, Pacific 4
- Rivers 4
- Transportation 4
- United States--Appropriations and expenditures 4
- Railroad engineering 3
- River surveys 3
- Water resources development 3
- Locks (Hydraulic engineering) 2
- Maps 2
- Bridges--Design and construction 1
- Cascade Range 1
- Railroad construction & maintenance 1
- Railroads--Design and construction 1
- United States--Armed Forces--Organization--Charts, diagrams, etc 1