Bridges: the original social network. Connecting communities since 850 BC.
Bridges: the original social network. Connecting communities since 850 BC.
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over 280/101 IC -ALEMANY BLVD
04-SF-101-1.94-SF
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 56,000 vehicles per day and is 66 years old.
Its sufficiency rating of 67.2 is above the national average of 63.6.
The NBI records a navigation clearance of 16 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 1256 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 16 feet above ground — standard overpass height.
About 56,000 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 38 feet wide with 2-3 lanes — moderate width.
This bridge crosses over land, not water — no water views 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
1960
66 years old
Structure Type
Concrete (Continuous) Box Beam (Multiple)
Total Length
1,256 ft
382.8 m
Deck Width
38 ft
11.5 m
Spans
14
sections between supports
Max Span
100 ft
longest unsupported section (30.5 m)
Traffic Lanes
2 lanes
One-way traffic
Clearance Below
16 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
56,000vehicles/day
37.73486°N, 122.40972°W
Concrete (Continuous) Box Beam (Multiple)
A concrete box beam bridge uses hollow rectangular concrete sections. The box shape provides excellent torsional resistance and allows 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.