Crunching the numbers on America's infrastructure...
Crunching the numbers on America's infrastructure...
What do you call a bridge that tells jokes? A pun-toon bridge.
over Chain of Rocks Cn & 2 LR
1.3 M E MISS R
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This bridge has a Poor overall condition rating of 2 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 525 vehicles per day and is 77 years old (reconstructed in 1999).
Its sufficiency rating of 33.7 places it below the national average of 63.6.
The NBI records a navigation clearance of 50 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 2368 feet long — a longer crossing, over 1 minute.
A truss bridge — the steel framework can provide a sense of enclosure.
About 50 feet above ground — an elevated crossing, similar to a 5-10 story building.
Only about 525 vehicles cross daily — very light traffic with low congestion risk.
The deck is 31 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
1949
77 years old (rebuilt 1999)
Structure Type
Steel Truss (Thru)
Total Length
2,368 ft
721.8 m
Deck Width
31 ft
9.4 m
Spans
17
sections between supports
Max Span
463 ft
longest unsupported section (141.1 m)
Traffic Lanes
1 lane
Clearance Below
50 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
525vehicles/day
38.76165°N, 90.14225°W
Steel Truss (Thru)
A steel truss bridge uses a framework of interconnected triangular elements. The geometric rigidity of triangles makes this design extremely efficient at distributing loads.
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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.