Fun fact: The average American crosses 4 bridges a day without even noticing.
Fun fact: The average American crosses 4 bridges a day without even noticing.
Analyzing deck conditions, superstructure ratings, and bad puns...
over MACKINAW RIVER
1.26 MI E OF ILL 117
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 14,200 vehicles per day and is 62 years old (reconstructed in 1998).
Its sufficiency rating of 50.1 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 422 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 14,200 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 41 feet wide with 2-3 lanes — moderate width.
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
1964
62 years old (rebuilt 1998)
Structure Type
Steel (Continuous) Stringer/Multi-beam/Girder
Total Length
422 ft
128.6 m
Deck Width
41 ft
12.6 m
Spans
4
sections between supports
Max Span
117 ft
longest unsupported section (35.7 m)
Traffic Lanes
2 lanes
One-way traffic
Daily Traffic
14,200vehicles/day
40.61494°N, 89.25312°W
Steel (Continuous) Stringer/Multi-beam/Girder
A steel stringer bridge uses parallel steel beams (stringers) to support the deck. This is one of the most common bridge types in the US, valued for its simplicity and strength.
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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.