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Topic
- River surveys 54
- River engineering 51
- United States--Appropriations and expenditures 50
- Locks (Hydraulic engineering) 5
- Maps 3
- United States--Armed Forces--Organization--Charts, diagrams, etc 3
- United States. Congress--Records and correspondence 3
- Bridges--Design and construction 2
- Canals--Design and construction--Costs 2
- Dams--Design and construction 2
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 38
- Willamette River >> Multnomah County >> Oregon >> United States 22
- Portland >> Clackamas County >> Oregon >> United States 12
- Oregon >> United States 9
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 5
- Snake River >> British Columbia >> Canada 5
- Vancouver >> Clark County >> Washington >> United States 5
- Yamhill River >> Yamhill County >> Oregon >> United States 5
- Astoria >> Clatsop County >> Oregon >> United States 4
- Rock Island Rapids >> Chelan County >> Washington >> United States 4
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Format
- image/jpeg 54
Decade
- 1890-1899 54
