Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge 42.7 - Duncan Creek, east of Skamania, Washington, Line Segment 047, Milepost 42.67. Sheet CC 517, 1920.

Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge 42.7 - Duncan Creek, east of Skamania, Washington, Line Segment 047, Milepost 42.67. Sheet CC - 517A, 1944.

Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge 44.3 - Woodard Creek, east of Skamania, Washington, Line Segment 047, Milepost 44.30. Sheet CC - 525A, 1944.

Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge 44.3 - Woodard Creek, east of Skamania, Washington, Line Segment 047, Milepost 44.30. Sheet NO 390, 1965.

Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge 47.0 - Hamilton Creek, east of Skamania, Washington, Line Segment 047, Milepost 47.02. Sheet R - 2 - 23, 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: Topographical Map, Bridge 42.7 - Duncan Creek, east of Skamania, Washington, Line Segment 047, Milepost 42.67. Sheet N - 1 - 10, undated.