Connecting the data points... literally.
Connecting the data points... literally.
Bridges: the original social network. Connecting communities since 850 BC.
over SAN FRANCISCO BAY-SOUTH
04-SM-084-R29.25-MLP
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 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 62,000 vehicles per day and is 45 years old.
Its sufficiency rating of 61.5 places it below the national average of 63.6.
The NBI records a navigation clearance of 85 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 8600 feet long — an extended crossing, several minutes.
A standard overpass design with solid barriers on each side.
About 85 feet above ground — an elevated crossing, similar to a 5-10 story building.
About 62,000 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 85 feet wide with multiple lanes — easy to stay in a center lane.
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
1981
45 years old
Structure Type
Steel (Continuous) Box Beam (Multiple)
Total Length
1.63 mi
2621.3 m
Deck Width
85 ft
25.9 m
Spans
15
sections between supports
Max Span
340 ft
longest unsupported section (103.6 m)
Traffic Lanes
6 lanes
Two-way traffic
Clearance Below
85 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
62,000vehicles/day
37.49915°N, 122.12838°W
Steel (Continuous) Box Beam (Multiple)
A steel box beam bridge uses hollow rectangular steel sections that provide excellent torsional resistance and allow for longer spans.
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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.