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Did you know? The oldest bridge in the NBI was built in 1697.
over BIG SIOUX RIVER
4S & 1.4E OF CASTLEWOOD
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Good overall condition rating of 7 out of 9. It is in good structural condition and is not classified as structurally deficient.
The bridge carries 66 vehicles per day and is 44 years old.
Its sufficiency rating of 70.3 is above the national average of 63.6.
For travelers with bridge anxiety
This bridge may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 99 feet long — a quick crossing, under 5 seconds at highway speed.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
Only about 66 vehicles cross daily — very light traffic with low congestion risk.
The deck is 33 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
1982
44 years old
Structure Type
Concrete (Continuous) Slab
Total Length
99 ft
30.3 m
Deck Width
33 ft
10.0 m
Spans
3
sections between supports
Max Span
38 ft
longest unsupported section (11.6 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
66vehicles/day
44.67397°N, 96.99947°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.