Spokane, Portland and Seattle Railway Engineering Drawing: Tower Sheave/Equalizer, Bridge E126.9 - Willamette River, south of Harrisburg, Oregon, Line Segment 442, Milepost 125.99. Sheet V - 4 - 5, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Tower Hood, Bridge T0.4 - Columbia River, south of Wishram, Washington, Line Segment 053, Milepost 0.37. Sheet WX - 208, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Tower Hood Detail, Bridge T0.4 - Columbia River, south of Wishram, Washington, Line Segment 053, Milepost 0.37. Sheet WX - 208, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Tower Details, Bridge A29.4S, west of Saint Helens, Oregon, Line Segment 440, Milepost 0.40. Sheet NO - 243, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topography, Bridge G2.1 - County Road, north of Lyle, Washington, Line Segment 439, Milepost 2.02. Sheet N - 1 - 14, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topography Map, Bridge 53.5 - Rock Creek, east of North Bonneville, Washington, Line Segment 047, Milepost 53.54. Sheet TV - 335, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topographical Map, Bridge A60.2 - Beaver Creek, west of Mayger, Oregon, Line Segment 440, Milepost 60.17, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topographical Map, Bridge 42.7 - Duncan Creek, east of Skamania, Washington, Line Segment 047, Milepost 42.67. Sheet N - 1 - 10, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topographic Map, Bridge 44.3 - Woodard Creek, east of Skamania, Washington, Line Segment 047, Milepost 44.30. Sheet TV - 334, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Topographic Map, Bridge 31.3 - Hathaway Creek, east of Washougal, Washington, Line Segment 047, Milepost 31.32. Sheet N - 1 - 7, undated.