Why do engineers love bridges? They're outstanding in their field.
Why do engineers love bridges? They're outstanding in their field.
Why did the bridge go to therapy? It had too many spans of anxiety.
over MISSOURI RIVER
NCL SOUTH SIOUX CITY
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 6 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 32,065 vehicles per day and is 45 years old (reconstructed in 1983).
Its sufficiency rating of 67.9 is above the national average of 63.6.
The NBI records a navigation clearance of 23 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 1502 feet long — a moderate crossing, about 30 seconds.
An arch bridge design with some openness to the surroundings.
About 23 feet above ground — moderate height, similar to a 3-5 story building.
About 32,065 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 68 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
1981
45 years old (rebuilt 1983)
Structure Type
Steel Arch (Thru)
Total Length
1,502 ft
457.8 m
Deck Width
68 ft
20.6 m
Spans
1
sections between supports
Max Span
425 ft
longest unsupported section (129.5 m)
Traffic Lanes
4 lanes
Two-way traffic
Clearance Below
23 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
32,065vehicles/day
42.48800°N, 96.41360°W
Steel Arch (Thru)
A steel arch bridge uses a curved steel structure to carry loads primarily through compression. These bridges are known for their elegant appearance and structural efficiency.
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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.