Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- 92 more...
- ItemWWASPSL8-042 - Spokane, Portland, and Seattle (SP&S) Trestle at Milepost 52, Oregon, undated
- ItemWWASPSL8-043 - Spokane, Portland, and Seattle (SP&S) Trestle at Milepost 52, Oregon, undated
- ItemWWASPSL8-044 - Spokane, Portland, and Seattle (SP&S) Trestle at Milepost 52, Oregon, undated
- ItemWWASPSL8-057 - Spokane, Portland, and Seattle (SP&S) Bridge at Clatskanie, Oregon, undated
- ItemWWASPSL8-067 - Spokane, Portland, and Seattle (SP&S) Drawbridge, Blind Slough, Oregon, undated
- ItemWWASPSL8-068 - Spokane, Portland, and Seattle (SP&S) Drawbridge, Blind Slough, Oregon, September 1965
- ItemWWASPSL8-082 - Spokane, Portland, and Seattle (SP&S) Youngs Bay Bridge at Astoria, Oregon, undated
- ItemWWASPSL8-084 - Spokane, Portland, and Seattle (SP&S) Columbia River Bridge at Astoria, Oregon, undated
- ItemWWASPSL8-102 - Spokane, Portland, and Seattle (SP&S) Youngs Bay Trestle at Astoria, Oregon, circa 1910
- 7 more...