Why do engineers love bridges? They're outstanding in their field.
Why do engineers love bridges? They're outstanding in their field.
Bridges: the original social network. Connecting communities since 850 BC.
over MISSISSIPPI RIVER
FORT MADISON IOWA
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Poor overall condition rating of 3 out of 9. This bridge is classified as being in poor condition, meaning one or more structural components have significant deterioration. Poor condition does not mean the bridge is unsafe to drive on, but it does mean repairs or replacement may be needed.
The bridge carries 2,500 vehicles per day and is 99 years old (reconstructed in 1980).
Its sufficiency rating of 45.8 places it below the national average of 63.6.
The NBI records a navigation clearance of 6 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 has some features that may be challenging for travelers with bridge anxiety. See the tips below for a more comfortable crossing.
This bridge is 3347 feet long — an extended crossing, several minutes.
A movable bridge — it may occasionally stop for boat traffic.
About 6 feet above ground — standard overpass height.
About 2,500 vehicles cross daily — light traffic, a smooth crossing.
The deck is 25 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
1927
99 years old (rebuilt 1980)
Structure Type
Steel Movable (Swing)
Total Length
3,347 ft
1020.2 m
Deck Width
25 ft
7.6 m
Spans
1
sections between supports
Max Span
525 ft
longest unsupported section (160.0 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
6 ft
navigation clearance under deck
Daily Traffic
2,500vehicles/day
40.62307°N, 91.29179°W
Steel Movable (Swing)
A movable bridge can change position to allow passage of boats or other traffic. Steel movable bridges include lift, bascule (drawbridge), and swing types.
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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.