Great Northern Railway Historical Society Blueprint Collection JSBP2472, Helena, Montana, undated. Montana Central Railway Blueprint Number Design # 2, Bridge # 82. (Prickley Pear Creek) - Sketch. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Northern Pacific Engineering Drawing: 30 Foot Deck Plate Girder (DPG) /44, Bridge 3 - 10 - Mile Creek, west of Helena, Montana, Line Segment 042, Milepost 3.1. Sheet 1076 - 69, undated.

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

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

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