Connecting the data points... literally.
Connecting the data points... literally.
Almost there! Just bridging the gap...
over RAILROAD STATION
4th Ave S & Jackson 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 13,500 vehicles per day and is 116 years old (reconstructed in 1981).
Its sufficiency rating of 55.5 places it below the national average of 63.6.
The NBI records a navigation clearance of 18 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 may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 1178 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 18 feet above ground — moderate height, similar to a 3-5 story building.
About 13,500 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 45 feet wide with 2-3 lanes — moderate width.
This bridge crosses over land, not water — no water views 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
1910
116 years old (rebuilt 1981)
Structure Type
Concrete (Continuous) Slab
Total Length
1,178 ft
359.1 m
Deck Width
45 ft
13.7 m
Spans
67
sections between supports
Max Span
31 ft
longest unsupported section (9.4 m)
Traffic Lanes
3 lanes
One-way traffic
Clearance Below
18 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
13,500vehicles/day
47.59750°N, 122.32917°W
Concrete (Continuous) Slab
A concrete slab bridge is a simple, solid concrete deck that acts as both the structural support and driving surface. Common for short spans, they are durable and low-maintenance.
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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.