Bridges: the original social network. Connecting communities since 850 BC.
Bridges: the original social network. Connecting communities since 850 BC.
A bridge's favorite type of music? Heavy metal. Or suspension... it depends.
over LYELL STREET
04-SF-280-R2.91-SF
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Poor overall condition rating of 4 out of 9. This bridge is classified as being in poor condition, meaning one or more structural components have significant deterioration. Poor condition does not mean the bridge is unsafe to drive on, but it does mean repairs or replacement may be needed.
The bridge carries 170,000 vehicles per day and is 62 years old (reconstructed in 1972).
Its sufficiency rating of 58.8 places it below the national average of 63.6.
The NBI records a navigation clearance of 30 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 179 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
About 30 feet above ground — moderate height, similar to a 3-5 story building.
About 170,000 vehicles cross daily — very heavy traffic, high congestion risk.
The deck is 144 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
1964
62 years old (rebuilt 1972)
Structure Type
Concrete (Continuous) Box Beam (Multiple)
Total Length
179 ft
54.7 m
Deck Width
144 ft
43.9 m
Spans
3
sections between supports
Max Span
81 ft
longest unsupported section (24.7 m)
Traffic Lanes
9 lanes
Two-way traffic
Clearance Below
30 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
170,000vehicles/day
37.73197°N, 122.43209°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.