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- River engineering 8
- United States--Appropriations and expenditures 8
- River surveys 7
- West (U.S.) 5
- Bodies of water 4
- Canals--Design and construction--Costs 4
- Locks (Hydraulic engineering) 4
- Transportation 4
- Boats and boating 2
- Dams--Design and construction 2
- Photography 2
- Railroad engineering 2
- Rivers 2
- United States. Congress--Records and correspondence 2
- Boatbuilding 1
- Canada, Western 1
- Canals 1
- Cartography 1
- Cascade Range 1
- Dams--Surveying 1