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Deception Pass Bridge

Deception Pass Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 26, 2014

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Key Facts

Facility Carried / Feature Intersected
WA-20 Over Deception Pass
Location
Rural: Island County, Washington and Skagit County, Washington: United States
Structure Type
Metal Cantilever 22 Panel Rivet-Connected Warren Deck Truss, Fixed and Approach Spans: Concrete T-Beam, Fixed
Construction Date and Builder / Engineer
1935 By Builder/Contractor: Wallace Bridge and Structural Steel Company of Seattle, Washington and Engineer/Design: Washington Department of Highways (O R. Elwell)

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
550 Feet (168 Meters)
Structure Length
976 Feet (297 Meters)
Roadway Width
22 Feet (6.71 Meters)
Spans
3 Main Span(s) and 4 Approach Span(s)
NBI Number
0001929A0000000

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Data Pages, PDF

HAER Documentation, Washington Cantilever Bridges - Data Pages - Drawings

View Historic Structure Reports For This Bridge

The Deception Pass Bridge is one of two bridges that carry WA-20 over two passes by way of tiny Pass Island. The other bridge is the Canoe Pass Bridge. At first glance the two bridges appear to be the same structure type. But in reality they are two different bridge types, with the Canoe Pass Bridge being an arch bridge and the Deception Pass Bridge being a cantilever truss bridge. The two bridges together create a truly unique setting where two visually similar but structurally different bridge types can be compared side by side. The bridge type was clearly determined by the natural terrain. The shorter gap of Canoe Pass and its shear cliffs were an ideal location for a steel arch span with skewbacks anchored into the cliff walls. The Deception Pass Bridge in contrast spans the larger gap that is Deception Pass, and with the absence of the shear cliffs that would be ideal for arch skewbacks, its multi-span superstructure supported by a system of piers and abutments are more appropriate.

These bridges are located in Deception Pass State Park and the bridges and they views they offer are major attractions for visitors to the area.

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Photo Galleries and Videos: Deception Pass Bridge

 
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Maps and Links: Deception Pass Bridge

Coordinates (Latitude, Longitude):
48.406110,-122.644540

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