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Did you know? The oldest bridge in the NBI was built in 1697.
over BLACK HAWK CREEK
CITY BRIDGE NO. 17
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 8,392 vehicles per day and is 55 years old (reconstructed in 1988).
Its sufficiency rating of 67.2 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 487 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
About 8,392 vehicles cross daily — light traffic, a smooth crossing.
The deck is 91 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
1971
55 years old (rebuilt 1988)
Structure Type
Prestressed Concrete (Continuous) Stringer/Multi-beam/Girder
Total Length
487 ft
148.4 m
Deck Width
91 ft
27.7 m
Spans
6
sections between supports
Max Span
82 ft
longest unsupported section (25.0 m)
Traffic Lanes
4 lanes
Two-way traffic
Daily Traffic
8,392vehicles/day
42.48778°N, 92.37698°W
Prestressed Concrete (Continuous) Stringer/Multi-beam/Girder
A prestressed concrete stringer bridge uses pretensioned concrete beams, where steel tendons are stretched before concrete is poured. This creates stronger, lighter spans.
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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.