Northern Pacific Engineering Drawing: General Plan and Falsework, Bridge 93.3 - Ostrander Creek, south of Castle Rock, Washington, Line Segment 052, Milepost 93.6. Sheet 1268 - 13, 1949. Note: Steel spans

Northern Pacific Engineering Drawing: Detail of Piers, Bridge 93.3 - Ostrander Creek, south of Castle Rock, Washington, Line Segment 052, Milepost 93.6. Sheet 785 - 18, 1914. Note: Steel spans

Northern Pacific Engineering Drawing: Detail of Ballast Deck, Bridge 93.1 - Underpass, south of Castle Rock, Washington, Line Segment 052, Milepost 93.2. Sheet 1054 - 29, 1957. Note: Pile trestle

Northern Pacific Engineering Drawing: Detail of Abutments, Bridge 93.3 - Ostrander Creek, south of Castle Rock, Washington, Line Segment 052, Milepost 93.6. Sheet 785 - 18, undated.

Northern Pacific Engineering Drawing: Ballast Deck Timber Trestle, Bridge 93 - Underpass, south of Castle Rock, Washington, Line Segment 052, Milepost 93.1. Sheet 1054 - 28, 1957. Note: Pile trestle

Northern Pacific Engineering Drawing: Abutments 1 and 4, Bridge 91 - Underpass, south of Castle Rock, Washington, Line Segment 052, Milepost 91.8. Sheet 371 - 6756 - 2, undated.