Crunching the numbers on America's infrastructure...
Crunching the numbers on America's infrastructure...
Why did the truss bridge break up with the beam bridge? It needed more support.
over ST. CHARLES RIVER
ST. CHARLES @ LAKE ISABEL
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 286 vehicles per day and is 88 years old (reconstructed in 1980).
Its sufficiency rating of 53.9 places it below 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 33 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 286 vehicles cross daily — very light traffic with low congestion risk.
The deck is 22 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
1938
88 years old (rebuilt 1980)
Structure Type
Steel Girder & Floorbeam
Total Length
33 ft
10.2 m
Deck Width
22 ft
6.7 m
Spans
1
sections between supports
Max Span
28 ft
longest unsupported section (8.6 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
286vehicles/day
37.98176°N, 105.06372°W
Steel Girder & Floorbeam
A steel girder bridge relies on large steel I-beams or plate girders as the primary load-bearing members. These bridges can span significant distances and carry heavy 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.