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Topic
- Iron and steel bridges 51
- Bridges 27
- Rivers 22
- Historic bridges 13
- Willamette River (Or.) 11
- Spokane Falls (Wash. : Waterfall) 10
- Rapids 9
- Columbia River 8
- Boats and boating 7
- Hydroelectric power plants 7
- Drawbridges 6
- Spillways 6
- Steel Bridge (Portland, Or.) 6
- Railroad bridges 5
- Steamboats 5
- Irrigation canals and flumes 4
- Oregon, Eastern 4
- Ships 4
- Waterfalls 4
- Buildings--Irrigation systems 3
