Great Northern Railway Historical Society Blueprint Collection JSBP4926, Snohomish Bridge, Washington, 1910. Interlocking at Snohomish Bridge. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Blueprint Number 1250-11, map of Preliminary Line along Snohomish River to Lake Washington, undated. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1250-2, map of Preliminary Location Edmunds to Mouth of Snohomish River, undated. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number D-35-2/3, map of Plat of First Class Tide Lands in Snohomish County, 1890. Other subject categories: Map

Northern Pacific Engineering Drawing: 180 Foot Through Span, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0. Sheet 778 - 2, undated.

Northern Pacific Engineering Drawing: Bill of Material/Details, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0. Sheet 778 - 2, undated.

Northern Pacific Engineering Drawing: Convert to Fixed Bridge, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0. Sheet 778 - 2, undated.

Northern Pacific Engineering Drawing: Detail Enlarged Footing, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0. Sheet 778 - 2, undated.