Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3001 - Bridges
- 3843 more...
- ItemBB033870 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, undated
- ItemBB033871 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, undated
- ItemBB033872 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, 1912
- ItemBB033873 - Spokane, Portland and Seattle Railway Engineering Drawing: Abutments, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, undated
- ItemBB033874 - Spokane, Portland and Seattle Railway Engineering Drawing: General Plan, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, undated
- ItemBB033875 - Spokane, Portland and Seattle Railway Engineering Drawing: General Plan, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, undated
- ItemBB033877 - Spokane, Portland and Seattle Railway Engineering Drawing: General Plan/Protection Pier, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB033878 - Spokane, Portland and Seattle Railway Engineering Drawing: Protect Pier Details, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB033879 - Spokane, Portland and Seattle Railway Engineering Drawing: Protect Pier Details, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- 66 more...