Why do engineers love bridges? They're outstanding in their field.
Why do engineers love bridges? They're outstanding in their field.
Why was the bridge always tired? Too many crossings.
over CALTRAIN UP RR CITY STS
04-SF-280-R4.40L-SF
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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 107,000 vehicles per day and is 61 years old.
Its sufficiency rating of 54.1 places it below the national average of 63.6.
The NBI records a navigation clearance of 14 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 21588 feet long — an extended crossing, several minutes.
A standard overpass design with solid barriers on each side.
About 14 feet above ground — standard overpass height.
About 107,000 vehicles cross daily — very heavy traffic, high congestion risk.
The deck is 109 feet wide with multiple lanes — easy to stay in a center lane.
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
1965
61 years old
Structure Type
Concrete (Continuous) Box Beam (Multiple)
Total Length
4.09 mi
6580.0 m
Deck Width
109 ft
33.3 m
Spans
234
sections between supports
Max Span
132 ft
longest unsupported section (40.2 m)
Traffic Lanes
6 lanes
Two-way traffic
Clearance Below
14 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
107,000vehicles/day
37.73559°N, 122.40574°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.