Fun fact: Covered bridges were roofed to protect the wood, not the travelers.
Fun fact: Covered bridges were roofed to protect the wood, not the travelers.
A bridge's favorite type of music? Heavy metal. Or suspension... it depends.
over BLACK RIVER
IN PORT HURON
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 9,076 vehicles per day and is 93 years old (reconstructed in 2007).
Its sufficiency rating of 66.3 is above the national average of 63.6.
The NBI records a navigation clearance of 1 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 272 feet long — a short crossing, about 10-15 seconds.
A movable bridge — it may occasionally stop for boat traffic.
About 1 feet above ground — standard overpass height.
About 9,076 vehicles cross daily — light traffic, a smooth crossing.
The deck is 57 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
1933
93 years old (rebuilt 2007)
Structure Type
Steel Movable (Bascule)
Total Length
272 ft
83.0 m
Deck Width
57 ft
17.3 m
Spans
1
sections between supports
Max Span
115 ft
longest unsupported section (35.0 m)
Traffic Lanes
3 lanes
Two-way traffic
Clearance Below
1 ft
navigation clearance under deck
Daily Traffic
9,076vehicles/day
42.97654°N, 82.42737°W
Steel Movable (Bascule)
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.