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over STRAITS OF MACKINAC
N OF MACKINAC BR (CAUSWAY
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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 11,076 vehicles per day and is 84 years old (reconstructed in 1985).
Its sufficiency rating of 69.8 is above the national average of 63.6.
The NBI records a navigation clearance of 9 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 may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 90 feet long — a quick crossing, under 5 seconds at highway speed.
A standard overpass design with solid barriers on each side.
About 9 feet above ground — standard overpass height.
About 11,076 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 59 feet wide with 3-4 lanes — standard 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
1942
84 years old (rebuilt 1985)
Structure Type
Steel Stringer/Multi-beam/Girder
Total Length
90 ft
27.4 m
Deck Width
59 ft
18.1 m
Spans
3
sections between supports
Max Span
30 ft
longest unsupported section (9.1 m)
Traffic Lanes
4 lanes
Two-way traffic
Clearance Below
9 ft
navigation clearance under deck
Daily Traffic
11,076vehicles/day
45.84573°N, 84.72347°W
Steel 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.