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Creator
- United States. Army. Office of the Chief of Engineers 7
Topic
- Locks (Hydraulic engineering) 7
- United States--Appropriations and expenditures 7
- River engineering 6
- Dams--Design and construction 5
- Canals--Design and construction--Costs 4
- River surveys 4
- West (U.S.) 2
- Bodies of water 1
- Cascade Range 1
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 7
- Columbia River >> Clatsop County >> Oregon >> United States 6
- Portland >> Clackamas County >> Oregon >> United States 4
- Astoria >> Clatsop County >> Oregon >> United States 3
- Cascade Locks >> Hood River County >> Oregon >> United States 3
- The Dalles >> Wasco County >> Oregon >> United States 3
- Vancouver >> Clark County >> Washington >> United States 3
- Yamhill River >> Yamhill County >> Oregon >> United States 3
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 2
- Cowlitz River >> Cowlitz County >> Washington >> United States 2
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Rights
- No Copyright - United States 7
Type
- Text 5
- Collection 2