Why did the truss bridge break up with the beam bridge? It needed more support.
Why did the truss bridge break up with the beam bridge? It needed more support.
The average US bridge is 48 years old. That's a lot of birthday candles.
over LONGBOAT KEY PASS
1.7MI SOUTH OF SR 684
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This bridge has a Fair overall condition rating of 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 17,300 vehicles per day and is 69 years old (reconstructed in 2005).
Its sufficiency rating of 53.0 places it below the national average of 63.6.
The NBI records a navigation clearance of 17 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 2129 feet long — a longer crossing, over 1 minute.
A movable bridge — it may occasionally stop for boat traffic.
About 17 feet above ground — moderate height, similar to a 3-5 story building.
About 17,300 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 37 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
1957
69 years old (rebuilt 2005)
Structure Type
Steel Movable (Bascule)
Total Length
2,129 ft
649.0 m
Deck Width
37 ft
11.4 m
Spans
1
sections between supports
Max Span
81 ft
longest unsupported section (24.7 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
17 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
17,300vehicles/day
27.44424°N, 82.68793°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.