Connecting the data points... literally.
Connecting the data points... literally.
Why did the bridge go to therapy? It had too many spans of anxiety.
over DUWAMISH RIVER W WATERWY
1200 SW Spokane St
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
Loading 3D model...
This bridge has a Fair overall condition rating of 6 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 108,179 vehicles per day and is 43 years old.
Its sufficiency rating of 72.1 is above the national average of 63.6.
The NBI records a navigation clearance of 140 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 1340 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 140 feet above ground — a high bridge with significant elevation.
About 108,179 vehicles cross daily — very heavy traffic, high congestion risk.
The deck is 106 feet wide with multiple lanes — easy to stay in a center lane.
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
1983
43 years old
Structure Type
Concrete (Continuous) Box Beam (Multiple)
Total Length
1,340 ft
408.4 m
Deck Width
106 ft
32.3 m
Spans
3
sections between supports
Max Span
590 ft
longest unsupported section (179.8 m)
Traffic Lanes
6 lanes
Two-way traffic
Clearance Below
140 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
108,179vehicles/day
47.57111°N, 122.35000°W
Concrete (Continuous) Box Beam (Multiple)
A concrete box beam bridge uses hollow rectangular concrete sections. The box shape provides excellent torsional resistance and allows for longer spans.
Learn more about this bridge typeNo ratings yet. Be the first to rate this bridge!
Sign in and track Washington to receive alerts when new inspection data is published. Premium members get bridge-specific notifications.
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.