Northern Pacific Engineering Drawing: 50 Foot - 11 Inch Through Plate Girder, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Shop Plan - Under Crossing, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Shop Plan - Under Crossing, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Shop Plan - Under Crossing, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Shop Plan - Under Crossing, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Shop Plan - Under Crossing, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Tie Plan, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.

Northern Pacific Engineering Drawing: Timber Approach, Bridge 87 - Highway 20, Sedro - Woolley, Washington, Line Segment 403, Milepost 87.05. Sheet 1233 - 16, undated.