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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.

Spokane, Portland and Seattle Railway Engineering Drawing: Topo Vicinity of Map, Bridge E81.4 - Underpass, south of Orville, Oregon, Line Segment 442, Milepost 81.41. Sheet S - 1 - 3, undated.