Loading... unlike some bridges, we promise not to leave you hanging.
Loading... unlike some bridges, we promise not to leave you hanging.
If I had a dime for every bridge I've crossed, I'd have about ten bucks by now.
over W WATERWAY OF DUWAMISH
1200 SW Spokane St
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Fair overall condition rating of 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 11,500 vehicles per day and is 35 years old.
Its sufficiency rating of 59.6 places it below the national average of 63.6.
The NBI records a navigation clearance of 55 feet — the minimum vertical space below the bridge deck. The total height of the bridge structure (including towers, railings, and superstructure) may be higher.
For travelers with bridge anxiety
This bridge has some features that may be challenging for travelers with bridge anxiety. See the tips below for a more comfortable crossing.
This bridge is 836 feet long — a moderate crossing, about 30 seconds.
A movable bridge — it may occasionally stop for boat traffic.
About 55 feet above ground — an elevated crossing, similar to a 5-10 story building.
About 11,500 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 51 feet wide with 3-4 lanes — standard width.
This bridge crosses over water. Focus on the road ahead — the water is far below.
This comfort score is designed to help individuals with bridge anxiety plan their travel. All bridges in the National Bridge Inventory are regularly inspected and deemed safe for travel. This is not medical advice — if you experience severe anxiety, please consult a healthcare professional.
Year Built
1991
35 years old
Structure Type
Prestressed Concrete Movable (Swing)
Total Length
836 ft
254.8 m
Deck Width
51 ft
15.5 m
Spans
3
sections between supports
Max Span
440 ft
longest unsupported section (134.1 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
55 ft
navigation clearance under deck
Clearance height compared to familiar objects
Height shown is the navigation clearance below the bridge deck. The total height of the bridge structure (including towers and superstructure) may be higher.
Daily Traffic
11,500vehicles/day
47.57139°N, 122.35361°W
Prestressed Concrete Movable (Swing)
A prestressed concrete stringer bridge uses pretensioned concrete beams, where steel tendons are stretched before concrete is poured. This creates stronger, lighter spans.
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Data from the National Bridge Inventory (NBI), maintained by the Federal Highway Administration (FHWA).
Data year: 2025. Conditions may have changed since the last inspection.
This information is provided for educational and informational purposes only. It should not be used as the sole basis for any decisions related to bridge safety or transportation planning. Always consult official sources and local authorities for the most current data.