Northern Pacific Engineering Drawing: Steel Spans S3 east and S3 West, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Steel Spans S2 east and S2 West, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Steel Spans S1 west and S5 East, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Steel Spans S1 east and S5 West, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Steel Bracing 30 Foot Deck Plate Girder (DPG), Bridge 3 - 10 - Mile Creek, west of Helena, Montana, Line Segment 042, Milepost 3.1. Sheet 1076 - 69, undated.

Northern Pacific Engineering Drawing: Steel Bents, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Shop Plan - Steel Spans, Bridge 1 - State Boulevard, Helena, Montana, Line Segment 042, Milepost 1.9. Sheet 1276 - 9, undated.

Northern Pacific Engineering Drawing: Girder Plan Details - Slab, Bridge 3 - 10 - Mile Creek, west of Helena, Montana, Line Segment 042, Milepost 3.1. Sheet 1076 - 69, undated.