Crunching the numbers on America's infrastructure...
Crunching the numbers on America's infrastructure...
Wow, there are a lot of bridges here... one second please.
over SR 4 & SR 48
SOUTH WILMINGTON VIADUCT
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 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 63,420 vehicles per day and is 62 years old (reconstructed in 1980).
Its sufficiency rating of 59.7 places it below the national average of 63.6.
The NBI records a navigation clearance of 15 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 2531 feet long — a longer crossing, over 1 minute.
A standard overpass design with solid barriers on each side.
About 15 feet above ground — standard overpass height.
About 63,420 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 42 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
1964
62 years old (rebuilt 1980)
Structure Type
Steel Stringer/Multi-beam/Girder
Total Length
2,531 ft
771.4 m
Deck Width
42 ft
12.9 m
Spans
34
sections between supports
Max Span
137 ft
longest unsupported section (41.9 m)
Traffic Lanes
2 lanes
One-way traffic
Clearance Below
15 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
63,420vehicles/day
39.74139°N, 75.56222°W
Steel Stringer/Multi-beam/Girder
A steel stringer bridge uses parallel steel beams (stringers) to support the deck. This is one of the most common bridge types in the US, valued for its simplicity and strength.
Learn more about this bridge typeNo ratings yet. Be the first to rate this bridge!
Sign in and track Delaware 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.