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Analyzing deck conditions, superstructure ratings, and bad puns...
over COWLITZ R & NP RY
2.0 E JCT SR 411
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 19,487 vehicles per day and is 65 years old (reconstructed in 1971).
Its sufficiency rating of 58.6 places it below the national average of 63.6.
The NBI records a navigation clearance of 42 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 1676 feet long — a longer crossing, over 1 minute.
A truss bridge — the steel framework can provide a sense of enclosure.
About 42 feet above ground — moderate height, similar to a 3-5 story building.
About 19,487 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 32 feet wide with 1-2 lanes — a narrower crossing.
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
1961
65 years old (rebuilt 1971)
Structure Type
Steel Truss (Thru)
Total Length
1,676 ft
510.8 m
Deck Width
32 ft
9.8 m
Spans
1
sections between supports
Max Span
300 ft
longest unsupported section (91.4 m)
Traffic Lanes
2 lanes
One-way traffic
Clearance Below
42 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
19,487vehicles/day
46.10691°N, 122.89442°W
Steel Truss (Thru)
A steel truss bridge uses a framework of interconnected triangular elements. The geometric rigidity of triangles makes this design extremely efficient at distributing loads.
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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.