Gathering condition ratings from coast to coast...
Gathering condition ratings from coast to coast...
Did you know? The oldest bridge in the NBI was built in 1697.
over U.S. 101 MARINA LAGOON
04-SM-092-R11.78-SM
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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 55,500 vehicles per day and is 55 years old.
Its sufficiency rating of 59.0 places it below the national average of 63.6.
The NBI records a navigation clearance of 15 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 4282 feet long — an extended crossing, several minutes.
A standard overpass design with solid barriers on each side.
About 15 feet above ground — standard overpass height.
About 55,500 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 42 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
1971
55 years old
Structure Type
Prestressed Concrete (Continuous) Box Beam (Multiple)
Total Length
4,282 ft
1305.2 m
Deck Width
42 ft
12.7 m
Spans
81
sections between supports
Max Span
220 ft
longest unsupported section (67.1 m)
Traffic Lanes
3 lanes
One-way traffic
Clearance Below
15 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
55,500vehicles/day
37.55270°N, 122.30242°W
Prestressed Concrete (Continuous) Box Beam (Multiple)
A prestressed concrete box beam bridge combines hollow box sections with prestressing technology, enabling longer spans with reduced weight and material usage.
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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.